AA furnace................  .....................  3113 B-2010..........  D1688-17 (C)........  I-4274-89.\51\
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES \36\..............  200.5, Rev 4.2 (2003)  3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 \68\; 200.7, Rev.
                                                                 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14 \3\, I-4020-
                                                                 (1994).                                                             05 \70\, I-4472-
                                                                                97.\81\
                                    DCP \36\..................  .....................  .....................  D4190-15............  See footnote.\34\
                                    Colorimetric (Neocuproine)  .....................  3500-Cu B-2011.......
                                    Colorimetric                .....................  3500-Cu C-2011.......  ....................  See footnote.\19\
                                     (Bathocuproine).
23. Cyanide--Total, mg/L..........  Automated UV digestion/     .....................  .....................  ....................  Kelada-01.\55\
                                     distillation and
                                     Colorimetry.
                                    Segmented Flow Injection,   .....................  .....................  D7511-12(17)........
                                     In-Line Ultraviolet
                                     Digestion, followed by
                                     gas diffusion amperometry.
                                    Manual distillation with    335.4, Rev. 1.0        4500-CN- B-2016 and C- D2036-09(15)(A),      10-204-00-1-X.\56\
                                     MgCl2, followed by any of   (1993) \57\.           2016.                  D7284-13(17).
                                     the following:
                                    Flow Injection, gas         .....................  .....................  D2036-09(15)(A)
                                     diffusion amperometry.                                                    D7284-13(17).
                                    Titrimetric...............  .....................  4500-CN- D-2016......  D2036-09(15)(A).....  p. 22.\9\
                                    Spectrophotometric, manual  .....................  4500-CN- E-2016......  D2036-09(15)(A).....  I-3300-85.\2\
                                    Semi-Automated \20\.......  335.4, Rev. 1.0        4500-CN- N-2016......  ....................  10-204-00-1-X \56\,
                                                                 (1993) \57\.                                                        I-4302-85.\2\
                                    Ion Chromatography........  .....................  .....................  D2036-09(15)(A).....
                                    Ion Selective Electrode...  .....................  4500-CN- F-2016......  D2036-09(15)(A).....
24. Cyanide-Available, mg/L.......  Cyanide Amenable to         .....................  4500-CN- G-2016......  D2036-09(15)(B).....
                                     Chlorination (CATC);
                                     Manual distillation with
                                     MgCl2, followed by
                                     Titrimetric or
                                     Spectrophotometric.
                                    Flow injection and ligand   .....................  .....................  D6888-16............  OIA-1677-09.\44\
                                     exchange, followed by gas
                                     diffusion
                                     amperometry.\59\
                                    Automated Distillation and  .....................  .....................  ....................  Kelada-01.\55\
                                     Colorimetry (no UV
                                     digestion).
24.A Cyanide-Free, mg/L...........  Flow Injection, followed    .....................  .....................  D7237-15 (A)........  OIA-1677-09.\44\
                                     by gas diffusion
                                     amperometry.
                                    Manual micro-diffusion and  .....................  .....................  D4282-15............
                                     colorimetry.
25. Fluoride--Total, mg/L.........  Manual distillation \6\,    .....................  4500-F- B-2011.......
                                     followed by any of the
                                     following:.
                                    Electrode, manual.........  .....................  4500-F- C-2011.......  D1179-16 (B)........
                                    Electrode, automated......  .....................  .....................  ....................  I-4327-85.\2\
                                    Colorimetric, (SPADNS)....  .....................  4500-F- D-2011.......  D1179-16 (A)........
                                    Automated complexone......  .....................  4500-F- E-2011.......
                                    Ion Chromatography........  300.0, Rev 2.1 (1993)  4110 B-2011 or C-2011  D4327-17............  993.30.\3\
                                                                 and 300.1, Rev 1.0
                                                                 (1997).
                                    CIE/UV....................  .....................  4140 B-2011..........  D6508-15............  D6508, Rev. 2.\54\
26. Gold--Total,\4\ mg/L..........  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011..........
                                    AA furnace................  231.2 (Issued 1978)    3113 B-2010..........
                                                                 \1\.
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14.\3\
                                                                 (1994).
                                    DCP.......................  .....................  .....................  ....................  See footnote.\34\
27. Hardness--Total, as CaCO3, mg/  Automated colorimetric....  130.1 (Issued 1971)
 L.                                                              \1\.
                                    Titrimetric (EDTA)........  .....................  2340 C-2011..........  D1126-17............  973.52B \3\, I-1338-
                                                                                85.\2\
                                    Ca plus Mg as their         .....................  2340 B-2011..........
                                     carbonates, by any
                                     approved method for Ca
                                     and Mg (See Parameters 13
                                     and 33), provided that
                                     the sum of the lowest
                                     point of quantitation for
                                     Ca and Mg is below the
                                     NPDES permit requirement
                                     for Hardness.
28. Hydrogen ion (pH), pH units...  Electrometric measurement.  .....................  4500-H\+\ B-2011.....  D1293-99 (A or B)...  973.41 \3\, I-1586-
                                                                                85.\2\

                                    Automated electrode.......  150.2 (Dec. 1982) \1\  .....................  ....................  See footnote \21\, I-
                                                                                2587-85.\2\
29. Iridium--Total,\4\ mg/L.......  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011..........
                                    AA furnace................  235.2 (Issued 1978)
                                                                 \1\.
                                    ICP/MS....................  .....................  3125 B-2011..........
30. Iron--Total,\4\ mg/L..........  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration \36\.  .....................  3111 B-2011 or 3111 C- D1068-15 (A)........  974.27 \3\, I-3381-
                                                                                2011.                                        85.\2\
                                    AA furnace................  .....................  3113 B-2010..........  D1068-15 (B)........
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES \36\..............  200.5, Rev. 4.2        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14.\3\
                                                                 (1994).
                                    DCP \36\..................  .....................  .....................  D4190-15............  See footnote.\34\
                                    Colorimetric                .....................  3500-Fe B-2011.......  D1068-15 (C)........  See footnote.\22\
                                     (Phenanthroline).
31. Kjeldahl Nitrogen \5\--Total,   Manual digestion \20\ and   .....................  4500-Norg B-2011 or C- D3590-17 (A)........  I-4515-91.\45\
 (as N), mg/L.                       distillation or gas                                2011 and 4500-NH3 B-
                                     diffusion, followed by                             2011.
                                     any of the following:
                                    Titration.................  .....................  4500-NH3 C-2011......  ....................  973.48.\3\
                                    Nesslerization............  .....................  .....................  D1426-15 (A)........
                                    Electrode.................  .....................  4500-NH3 D-2011 or E-  D1426-15 (B)........
                                                                                2011.
                                    Semi-automated phenate....  350.1, Rev. 2.0        4500-NH3 G-2011......
                                                                 (1993).               4500-NH3 H-2011......
                                    Manual phenate,             .....................  4500-NH3 F-2011......  ....................  See footnote.\60\
                                     salicylate, or other
                                     substituted phenols in
                                     Berthelot reaction based
                                     methods.
                                    Automated gas diffusion,    .....................  .....................  ....................  Timberline Ammonia-
                                     followed by conductivity                                                                        001.\74\
                                     cell analysis.
                                    Automated gas diffusion     .....................  .....................  ....................  FIAlab 100.\82\
                                     followed by fluorescence
                                     detector analysis.
                                    Automated Methods for TKN
                                     that do not require
                                     manual distillation.
                                    Automated phenate,          351.1 (Rev. 1978) \1\  .....................  ....................  I-4551-78.\8\
                                     salicylate, or other
                                     substituted phenols in
                                     Berthelot reaction based
                                     methods colorimetric
                                     (auto digestion and
                                     distillation).
                                    Semi-automated block        351.2, Rev. 2.0        4500-Norg D-2011.....  D3590-17 (B)........  I-4515-91.\45\
                                     digestor colorimetric       (1993).
                                     (distillation not
                                     required).
                                    Block digester, followed    .....................  .....................  ....................  See footnote.\39\
                                     by Auto distillation and
                                     Titration.
                                    Block digester, followed    .....................  .....................  ....................  See footnote.\40\
                                     by Auto distillation and
                                     Nesslerization.
                                    Block Digester, followed    .....................  .....................  ....................  See footnote.\41\
                                     by Flow injection gas
                                     diffusion (distillation
                                     not required).
                                    Digestion with              .....................  .....................  ....................  Hach 10242.\76\
                                     peroxdisulfate, followed
                                     by Spectrophotometric
                                     (2,6-dimethyl phenol).
                                    Digestion with persulfate,  .....................  .....................  ....................  NCASI TNTP
                                     followed by Colorimetric.                                                                       W10900.\77\
32. Lead--Total,\4\ mg/L..........  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration \36\.  .....................  3111 B-2011 or 3111 C- D3559-15 (A or B)...  974.27 \3\, I-3399-
                                                                                2011..                                       85.\2\
                                    AA furnace................  .....................  3113 B-2010..........  D3559-15 (D)........  I-4403-89.\51\
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES \36\..............  200.5, Rev. 4.2        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14 \3\, I-4472-
                                                                 (1994).                                                             97.\81\
                                    DCP \36\..................  .....................  .....................  D4190-15............  See footnote.\34\
                                    Voltametry \11\...........  .....................  .....................  D3559-15 (C)........
                                    Colorimetric (Dithizone)..  .....................  3500-Pb B-2011.......  ....................  ....................
33. Magnesium--Total,\4\ mg/L.....  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011..........  D511-14 (B).........  974.27 \3\, I-3447-
                                                                                85.\2\
                                    ICP/AES...................  200.5, Rev. 4.2        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14.\3\
                                                                 (1994).
                                    DCP.......................  .....................  .....................  ....................  See footnote.\34\
                                    Ion Chromatography........  .....................  .....................  D6919-17............

34. Manganese--Total,\4\ mg/L.....  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration \36\.  .....................  3111 B-2011..........  D858-17 (A or B)....  974.27 \3\, I-3454-
                                                                                85.\2\
                                    AA furnace................  .....................  3113 B-2010..........  D858-17 (C).........
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES \36\..............  200.5, Rev. 4.2        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14 \3\, I-4472-
                                                                 (1994).                                                             97.\81\
                                    DCP \36\..................  .....................  .....................  D4190-15............  See footnote.\34\
                                    Colorimetric (Persulfate).  .....................  3500-Mn B-2011.......  ....................  920.203.\3\
                                    Colorimetric (Periodate)..  .....................  .....................  ....................  See footnote.\23\
35. Mercury--Total, mg/L..........  Cold vapor, Manual........  245.1, Rev. 3.0        3112 B-2011..........  D3223-17............  977.22 \3\, I-3462-
                                                                 (1994).                                                             85.\2\
                                    Cold vapor, Automated.....  245.2 (Issued 1974)
                                                                 \1\.
                                    Cold vapor atomic           245.7 Rev. 2.0 (2005)  .....................  ....................  I-4464-01.\71\
                                     fluorescence spectrometry   \17\.
                                     (CVAFS).
                                    Purge and Trap CVAFS......  1631E \43\...........
36. Molybdenum--Total,\4\ mg/L....  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 D-2011..........  ....................  I-3490-85.\2\
                                    AA furnace................  .....................  3113 B-2010..........  ....................  I-3492-96.\47\
                                    ICP/AES...................  200.7, Rev. 4.4        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14 \3\, I-4472-
                                                                 (1994).                                                             97.\81\
                                    DCP.......................  .....................  .....................  ....................  See footnote.\34\
37. Nickel--Total,\4\ mg/L........  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration \36\.  .....................  3111 B-2011 or.......  D1886-14 (A or B)...  I-3499-85.\2\
                                                                                3111 C-2011..........
                                    AA furnace................  .....................  3113 B-2010..........  D1886-14 (C)........  I-4503-89.\51\
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES \36\..............  200.5, Rev. 4.2        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14 \3\, I-4020-
                                                                 (1994).                                                             05 \70\ I-4472-
                                                                                97.\81\
                                    DCP \36\..................  .....................  .....................  D4190-15............  See footnote.\34\
38. Nitrate (as N), mg/L..........  Ion Chromatography........  300.0, Rev. 2.1        4110 B-2011 or C-2011  D4327-17............  993.30.\3\
                                                                 (1993) and 300.1,
                                                                 Rev. 1.0 (1997).
                                    CIE/UV....................  .....................  4140 B-2011..........  D6508-15............  D6508, Rev. 2.\54\
                                    Ion Selective Electrode...  .....................  4500-NO3- D-2016.....
                                    Colorimetric (Brucine       352.1 (Issued 1971)    .....................  ....................  973.50 \3\, 419D 1
                                     sulfate).                   \1\.                                                                7, p. 28.\9\
                                    Spectrophotometric (2,6-    .....................  .....................  ....................  Hach 10206.\75\
                                     dimethylphenol).
                                    Nitrate-nitrite N minus
                                     Nitrite N (See parameters
                                     39 and 40)
39. Nitrate-nitrite (as N), mg/L..  Cadmium reduction, Manual.  .....................  4500-NO3- E-2016.....  D3867-16 (B)........
                                    Cadmium reduction,          353.2, Rev. 2.0        4500-NO3- F-2016.....  D3867-16 (A)........  I-2545-90.\51\
                                     Automated.                  (1993).               4500-NO3- I-2016.....
                                    Automated hydrazine.......  .....................  4500-NO3- H-2016.....
                                    Reduction/Colorimetric....  .....................  .....................  ....................  See footnote.\62\
                                    Ion Chromatography........  300.0, Rev. 2.1        4110 B-2011 or C-2011  D4327-17............  993.30.\3\
                                                                 (1993) and 300.1,
                                                                 Rev. 1.0 (1997).
                                    CIE/UV....................  .....................  4140 B-2011..........  D6508-15............  D6508, Rev. 2.\54\
                                    Enzymatic reduction,        .....................  .....................  D7781-14............  I-2547-11 \72\
                                     followed by automated                                                                          I-2548-11 \72\
                                     colorimetric                                                                                N07-0003.\73\
                                     determination.
                                    Enzymatic reduction,        .....................  4500-NO3- J-2018.....
                                     followed by manual
                                     colorimetric
                                     determination.
                                    Spectrophotometric (2,6-    .....................  .....................  ....................  Hach 10206.\75\
                                     dimethylphenol).
40. Nitrite (as N), mg/L..........  Spectrophotometric: Manual  .....................  4500-NO2- B-2011.....  ....................  See footnote.\25\
                                    Automated (Diazotization).  .....................  .....................  ....................  I-4540-85 \2\, See
                                                                                footnote \62\
                                                                                I-2540-90.\80\
                                    Automated (*bypass cadmium  353.2, Rev. 2.0        4500-NO3- F-2016.....  D3867-16 (A)........  I-4545-85.\2\
                                     reduction).                 (1993).               4500-NO3- I-2016.....
                                    Manual (*bypass cadmium or  .....................  4500-NO3- E-2016,      D3867-16 (B)........
                                     enzymatic reduction).                              4500-NO3\-\ J-2018.
                                    Ion Chromatography........  300.0, Rev. 2.1        4110 B-2011 or C-2011  D4327-17............  993.30.\3\
                                                                 (1993) and 300.1,
                                                                 Rev. 1.0 (1997).
                                    CIE/UV....................  .....................  4140 B-2011..........  D6508-15............  D6508, Rev. 2.\54\

                                    Automated (* bypass         .....................  .....................  D7781-14............  I-2547-11 \72\
                                     Enzymatic reduction).                                                                          I-2548-11 \72\
                                                                                N07-0003.\73\
41. Oil and grease--Total           Hexane extractable          1664 Rev. A; 1664      5520 B-2011 \38\.....
 recoverable, mg/L.                  material (HEM): n-Hexane    Rev. B \42\.
                                     extraction and gravimetry.
                                    Silica gel treated HEM      1664 Rev. A; 1664      5520 B-2011 \38\ and
                                     (SGT-HEM): Silica gel       Rev. B \42\.           5520 F-2011 \38\.
                                     treatment and gravimetry.
42. Organic carbon--Total (TOC),    Combustion................  .....................  5310 B-2014..........  D7573-09(17)........  973.47 \3\, p.
 mg/L.                                                                                14.\24\
                                    Heated persulfate or UV     .....................  5310 C-2014..........  D4839-03(17)........  973.47 \3\, p.
                                     persulfate oxidation.                             5310 D-2011..........                         14.\24\
43. Organic nitrogen (as N), mg/L.  Total Kjeldahl N
                                     (Parameter 31) minus
                                     ammonia N (Parameter 4)
44. Ortho-phosphate (as P), mg/L..  Ascorbic acid method:
                                    Automated.................  365.1, Rev. 2.0        4500-P F-2011 or G-    ....................  973.56 \3\, I-4601-
                                                                 (1993).                2011.                                        85 \2\, I-2601-
                                                                                90.\80\
                                    Manual, single-reagent....  .....................  4500-P E-2011........  D515-88 (A).........  973.55.\3\
                                    Manual, two-reagent.......  365.3 (Issued 1978)
                                                                 \1\.
                                    Ion Chromatography........  300.0, Rev. 2.1        4110 B-2011 or C-2011  D4327-17............  993.30.\3\
                                                                 (1993) and 300.1,
                                                                 Rev. 1.0 (1997).
                                    CIE/UV....................  .....................  4140 B-2011..........  D6508-15............  D6508, Rev. 2.\54\
45. Osmium--Total \4\, mg/L.......  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 D-2011..........
                                    AA furnace................  252.2 (Issued 1978)
                                                                 \1\.
46. Oxygen, dissolved, mg/L.......  Winkler (Azide              .....................  4500-O (B-F)-2016....  D888-12 (A).........  973.45B \3\, I-1575-
                                     modification).                                                                                78.\8\
                                    Electrode.................  .....................  4500-O G-2016........  D888-12 (B).........  I-1576-78.\8\
                                    Luminescence-Based Sensor.  .....................  4500-O H-2016........  D888-12 (C).........  See footnote.\63\
                                                                                See footnote.\64\
47. Palladium--Total,\4\ mg/L.....  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011..........
                                    AA furnace................  253.2 (Issued 1978)
                                                                 \1\.
                                    ICP/MS....................  .....................  3125 B-2011..........
                                    DCP.......................  .....................  .....................  ....................  See footnote.\34\
48. Phenols, mg/L.................  Manual distillation \26\,   420.1 (Rev. 1978) \1\  5530 B-2010..........  D1783-01(12)
                                     followed by any of the
                                     following:
                                    Colorimetric (4AAP) manual  420.1 (Rev. 1978) \1\  5530 D-2010 \27\.....  D1783-01(12) (A or
                                                                                B)
                                    Automated colorimetric      420.4 Rev. 1.0 (1993)
                                     (4AAP).
49. Phosphorus (elemental), mg/L..  Gas-liquid chromatography.  .....................  .....................  ....................  See footnote.\28\
50. Phosphorus--Total, mg/L.......  Digestion \20\, followed    .....................  4500-P B(5)-2011.....  ....................  973.55.\3\
                                     by any of the following:
                                    Manual....................  365.3 (Issued 1978)    4500-P E-2011........  D515-88 (A)
                                                                 \1\.
                                    Automated ascorbic acid     365.1 Rev. 2.0 (1993)  4500-P (F-H)-2011....  ....................  973.56 \3\, I-4600-
                                     reduction.                                                                                85.\2\
                                    ICP/AES 4 36..............  200.7, Rev. 4.4        3120 B-2011..........  ....................  I-4471-97.\50\
                                                                 (1994).
                                    Semi-automated block        365.4 (Issued 1974)    .....................  D515-88 (B).........  I-4610-91.\48\
                                     digestor (TKP digestion).   \1\.
                                    Digestion with persulfate,  .....................  .....................  ....................  NCASI TNTP
                                     followed by Colorimetric.                                                                       W10900.\77\
51. Platinum--Total,\4\ mg/L......  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011..........
                                    AA furnace................  255.2 (Issued 1978)
                                                                 \1\.
                                    ICP/MS....................  .....................  3125 B-2011..........
                                    DCP.......................  .....................  .....................  ....................  See footnote.\34\
52. Potassium--Total,\4\ mg/L.....  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011..........  ....................  973.53 \3\, I-3630-
                                                                                85.\2\
                                    ICP/AES...................  200.7, Rev. 4.4        3120 B-2011..........
                                                                 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14.\3\
                                                                 (1994).
                                    Flame photometric.........  .....................  3500-K B-2011........
                                    Electrode.................  .....................  3500-K C-2011........
                                    Ion Chromatography........  .....................  .....................  D6919-17............
53. Residue--Total, mg/L..........  Gravimetric, 103-105[deg].  .....................  2540 B-2015..........  ....................  I-3750-85.\2\
54. Residue--filterable, mg/L.....  Gravimetric, 180[deg].....  .....................  2540 C-2015..........  D5907-13............  I-1750-85.\2\
55. Residue--non-filterable (TSS),  Gravimetric, 103-105[deg]   .....................  2540 D-2015..........  D5907-13............  I-3765-85.\2\
 mg/L.                               post-washing of residue.
56. Residue--settleable, ml/L.....  Volumetric (Imhoff cone),   .....................  2540 F-2015..........
                                     or gravimetric.

57. Residue--Volatile, mg/L.......  Gravimetric, 550[deg].....  160.4 (Issued 1971)    2540 E-2015..........  ....................  I-3753-85.\2\
                                                                 \1\.
58. Rhodium--Total,\4\ mg/L.......  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration, or..  .....................  3111 B-2011..........
                                    AA furnace................  265.2 (Issued 1978)
                                                                 \1\.
                                    ICP/MS....................  .....................  3125 B-2011..........
59. Ruthenium--Total,\4\ mg/L.....  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration, or..  .....................  3111 B-2011..........
                                    AA furnace................  267.2 \1\............
                                    ICP/MS....................  .....................  3125 B-2011..........
60. Selenium--Total,\4\ mg/L......  Digestion \4\, followed by
                                     any of the following:
                                    AA furnace................  .....................  3113 B-2010..........  D3859-15 (B)........  I-4668-98.\49\
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES \36\..............  200.5, Rev 4.2 (2003)  3120 B-2011..........  D1976-12
                                                                 \68\; 200.7, Rev.
                                                                 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14 \3\, I-4020-
                                                                 (1994).                                                             05 \70\ I-4472-
                                                                                97.\81\
                                    AA gaseous hydride........  .....................  3114 B-2011, or 3114   D3859-15 (A)........  I-3667-85.\2\
                                                                                C-2011.
61. Silica--Dissolved,\37\ mg/L...  0.45-micron filtration
                                     followed by any of the
                                     following:
                                    Colorimetric, Manual......  .....................  4500-SiO2 C-2011.....  D859-16.............  I-1700-85.\2\
                                    Automated                   .....................  4500-SiO2 E-2011 or F- ....................  I-2700-85.\2\
                                     (Molybdosilicate).                                 2011.
                                    ICP/AES...................  200.5, Rev. 4.2        3120 B-2011..........  ....................  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14.\3\
                                                                 (1994).
62. Silver--Total,\4, 31\ mg/L....  Digestion 4 29, followed
                                     by any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011 or 3111 C- ....................  974.27 \3\, p. 37
                                                                                2011.                                        \9\, I-3720-85.\2\
                                    AA furnace................  .....................  3113 B-2010..........  ....................  I-4724-89.\51\
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES...................  200.5, Rev. 4.2        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14 \3\, I-4472-
                                                                 (1994).                                                             97.\81\
                                    DCP.......................  .....................  .....................  ....................  See footnote.\34\
63. Sodium--Total,\4\ mg/L........  Digestion \4\, followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011..........  ....................  973.54 \3\, I-3735-
                                                                                85.\2\
                                    ICP/AES...................  200.5, Rev. 4.2        3120 B-2011..........  ....................  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14.\3\
                                                                 (1994).
                                    DCP.......................  .....................  .....................  ....................  See footnote.\34\
                                    Flame photometric.........  .....................  3500-Na B-2011.......
                                    Ion Chromatography........  .....................  .....................  D6919-17............
64. Specific conductance,           Wheatstone bridge.........  120.1 (Rev. 1982) \1\  2510 B-2011..........  D1125-95(99) (A)....  973.40,\3\ I-2781-
 micromhos/cm at 25 [deg]C.                                                                                85.\2\
65. Sulfate (as SO4), mg/L........  Automated colorimetric....  375.2, Rev. 2.0        4500-SO4\2-\ F-2011
                                                                 (1993).                or G-2011.
                                    Gravimetric...............  .....................  4500-SO4\2-\ C-2011    ....................  925.54.\3\
                                                                                or D-2011.
                                    Turbidimetric.............  .....................  4500-SO4\2-\ E-2011..  D516-16.............
                                    Ion Chromatography........  300.0, Rev. 2.1        4110 B-2011 or C-2011  D4327-17............  993, I-4020-05
                                                                 (1993) and 300.1,                                                   \70\.303
                                                                 Rev. 1.0 (1997).
                                    CIE/UV....................  .....................  4140 B-2011..........  D6508-15............  D6508, Rev. 2.\54\
66. Sulfide (as S), mg/L..........  Sample Pretreatment.......  .....................  4500-S 2- B, C-2011..
                                    Titrimetric (iodine)......  .....................  4500-S 2- F-2011.....  ....................  I-3840-85.\2\
                                    Colorimetric (methylene     .....................  4500-S 2- D-2011.....
                                     blue).
                                    Ion Selective Electrode...  .....................  4500-S 2- G-2011.....  D4658-15............
67. Sulfite (as SO3), mg/L........  Titrimetric (iodine-        .....................  4500-SO32- B-2011....
                                     iodate).
68. Surfactants, mg/L.............  Colorimetric (methylene     .....................  5540 C-2011..........  D2330-02............
                                     blue).
69. Temperature, [deg]C...........  Thermometric..............  .....................  2550 B-2010..........  ....................  See footnote.\32\
70. Thallium-Total,\4\ mg/L.......  Digestion,\4\ followed by
                                     any of the following:

                                    AA direct aspiration......  .....................  3111 B-2011..........
                                    AA furnace................  279.2 (Issued 1978) \  3113 B-2010..........
                                                                 1\.
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES...................  200.7, Rev. 4.4        3120 B-2011..........  D1976-12............
                                                                 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14,\3\ I-4471-97
                                                                 (1994).                                                             \50\ I-4472-97.\81\
71. Tin-Total,\4\ mg/L............  Digestion,\4\ followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 B-2011..........  ....................  I-3850-78.\8\
                                    AA furnace................  .....................  3113 B-2010..........
                                    STGFAA....................  200.9, Rev. 2.2
                                                                 (1994).
                                    ICP/AES...................  200.5, Rev. 4.2
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14.\3\
                                                                 (1994).
72. Titanium-Total,\4\ mg/L.......  Digestion,\4\ followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 D-2011..........
                                    AA furnace................  283.2 (Issued 1978)
                                                                 \1\.
                                    ICP/AES...................  200.7, Rev. 4.4
                                                                 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14.\3\
                                                                 (1994).
                                    DCP.......................  .....................  .....................  ....................  See footnote.\34\
73. Turbidity, NTU \53\...........  Nephelometric.............  180.1, Rev. 2.0        2130 B-2011..........  D1889-00............  I-3860-85 \2\
                                                                 (1993).                                                            See footnote \65\
                                                                                See footnote \66\
                                                                                See footnote.\67\
74. Vanadium-Total,\4\ mg/L.......  Digestion,\4\ followed by
                                     any of the following:
                                    AA direct aspiration......  .....................  3111 D-2011..........
                                    AA furnace................  .....................  3113 B-2010..........  D3373-17............
                                    ICP/AES...................  200.5, Rev. 4.2        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14,\3\ I-4020-
                                                                 (1994).                                                             05.\70\
                                    DCP.......................  .....................  .....................  D4190-15............  See footnote.\34\
                                    Colorimetric (Gallic Acid)  .....................  3500-V B-2011........
75. Zinc-Total\4\, mg/L...........  Digestion,\4\ followed by
                                     any of the following:
                                    AA direct aspiration \36\.  .....................  3111 B-2011 or 3111 C- D1691-17 (A or B)...  974.27,\3\ p. 37,\9\
                                                                                2011.                                        I-3900-85.\2\
                                    AA furnace................  289.2 (Issued 1978)
                                                                 \1\.
                                    ICP/AES \36\..............  200.5, Rev. 4.2        3120 B-2011..........  D1976-12............  I-4471-97.\50\
                                                                 (2003) \68\; 200.7,
                                                                 Rev. 4.4 (1994).
                                    ICP/MS....................  200.8, Rev. 5.4        3125 B-2011..........  D5673-16............  993.14,\3\ I-4020-05
                                                                 (1994).                                                             \70\ I-4472-97.\81\
                                    DCP \36\..................  .....................  .....................  D4190-15............  See footnote.\34\
                                    Colorimetric (Zincon).....  .....................  3500 Zn B-2011.......  ....................  See footnote.\33\
76. Acid Mine Drainage............  ..........................  1627 \69\............
--------------------------------------------------------------------------------------------------------------------------------------------------------
Table IB Notes:
\1\ Methods for Chemical Analysis of Water and Wastes, EPA-600/4-79-020. Revised March 1983 and 1979, where applicable. U.S. EPA.
\2\ Methods for Analysis of Inorganic Substances in Water and Fluvial Sediments, Techniques of Water-Resource Investigations of the U.S. Geological
  Survey, Book 5, Chapter A1., unless otherwise stated. 1989. USGS.
\3\ Official Methods of Analysis of the Association of Official Analytical Chemists, Methods Manual, Sixteenth Edition, 4th Revision, 1998. AOAC
  International.
\4\ For the determination of total metals (which are equivalent to total recoverable metals) the sample is not filtered before processing. A digestion
  procedure is required to solubilize analytes in suspended material and to break down organic-metal complexes (to convert the analyte to a detectable
  form for colorimetric analysis). For non-platform graphite furnace atomic absorption determinations, a digestion using nitric acid (as specified in
  Section 4.1.3 of Methods for Chemical Analysis of Water and Wastes) is required prior to analysis. The procedure used should subject the sample to
  gentle acid refluxing, and at no time should the sample be taken to dryness. For direct aspiration flame atomic absorption (FLAA) determinations, a
  combination acid (nitric and hydrochloric acids) digestion is preferred, prior to analysis. The approved total recoverable digestion is described as
  Method 200.2 in Supplement I of ``Methods for the Determination of Metals in Environmental Samples'' EPA/600R-94/111, May, 1994, and is reproduced in
  EPA Methods 200.7, 200.8, and 200.9 from the same Supplement. However, when using the gaseous hydride technique or for the determination of certain
  elements such as antimony, arsenic, selenium, silver, and tin by non-EPA graphite furnace atomic absorption methods, mercury by cold vapor atomic
  absorption, the noble metals and titanium by FLAA, a specific or modified sample digestion procedure may be required, and, in all cases the referenced
  method write-up should be consulted for specific instruction and/or cautions. For analyses using inductively coupled plasma-atomic emission
  spectrometry (ICP-AES), the direct current plasma (DCP) technique or EPA spectrochemical techniques (platform furnace AA, ICP-AES, and ICP-MS), use
  EPA Method 200.2 or an approved alternate procedure (e.g., CEM microwave digestion, which may be used with certain analytes as indicated in Table IB);
  the total recoverable digestion procedures in EPA Methods 200.7, 200.8, and 200.9 may be used for those respective methods. Regardless of the
  digestion procedure, the results of the analysis after digestion procedure are reported as ``total'' metals.
\5\ Copper sulfate or other catalysts that have been found suitable may be used in place of mercuric sulfate.
\6\ Manual distillation is not required if comparability data on representative effluent samples are on file to show that this preliminary distillation
  step is not necessary; however, manual distillation will be required to resolve any controversies. In general, the analytical method should be
  consulted regarding the need for distillation. If the method is not clear, the laboratory may compare a minimum of 9 different sample matrices to
  evaluate the need for distillation. For each matrix, a matrix spike and matrix spike duplicate are analyzed both with and without the distillation
  step (for a total of 36 samples, assuming 9 matrices). If results are comparable, the laboratory may dispense with the distillation step for future
  analysis. Comparable is defined as <20% RPD for all tested matrices). Alternatively, the two populations of spike recovery percentages may be compared
  using a recognized statistical test.

\7\ Industrial Method Number 379-75 WE Ammonia, Automated Electrode Method, Technicon Auto Analyzer II. February 19, 1976. Bran & Luebbe Analyzing
  Technologies Inc.
\8\ The approved method is that cited in Methods for Determination of Inorganic Substances in Water and Fluvial Sediments, Techniques of Water-Resources
  Investigations of the U.S. Geological Survey, Book 5, Chapter A1. 1979. USGS.
\9\ American National Standard on Photographic Processing Effluents. April 2, 1975. American National Standards Institute.
\10\ In-Situ Method 1003-8-2009, Biochemical Oxygen Demand (BOD) Measurement by Optical Probe. 2009. In-Situ Incorporated.
\11\ The use of normal and differential pulse voltage ramps to increase sensitivity and resolution is acceptable.
\12\ Carbonaceous biochemical oxygen demand (CBOD5) must not be confused with the traditional BOD5 test method which measures ``total 5-day BOD.'' The
  addition of the nitrification inhibitor is not a procedural option but must be included to report the CBOD5 parameter. A discharger whose permit
  requires reporting the traditional BOD5 may not use a nitrification inhibitor in the procedure for reporting the results. Only when a discharger's
  permit specifically states CBOD5 is required can the permittee report data using a nitrification inhibitor.
\13\ OIC Chemical Oxygen Demand Method. 1978. Oceanography International Corporation.
\14\ Method 8000, Chemical Oxygen Demand, Hach Handbook of Water Analysis, 1979. Hach Company.
\15\ The back-titration method will be used to resolve controversy.
\16\ Orion Research Instruction Manual, Residual Chlorine Electrode Model 97-70. 1977. Orion Research Incorporated. The calibration graph for the Orion
  residual chlorine method must be derived using a reagent blank and three standard solutions, containing 0.2, 1.0, and 5.0 mL 0.00281 N potassium
  iodate/100 mL solution, respectively.
\17\ Method 245.7, Mercury in Water by Cold Vapor Atomic Fluorescence Spectrometry, EPA-821-R-05-001. Revision 2.0, February 2005. US EPA.
\18\ National Council of the Paper Industry for Air and Stream Improvement (NCASI) Technical Bulletin 253 (1971) and Technical Bulletin 803, May 2000.
\19\ Method 8506, Bicinchoninate Method for Copper, Hach Handbook of Water Analysis. 1979. Hach Company.
\20\ When using a method with block digestion, this treatment is not required.
\21\ Industrial Method Number 378-75WA, Hydrogen ion (pH) Automated Electrode Method, Bran & Luebbe (Technicon) Autoanalyzer II. October 1976. Bran &
  Luebbe Analyzing Technologies.
\22\ Method 8008, 1,10-Phenanthroline Method using FerroVer Iron Reagent for Water. 1980. Hach Company.
\23\ Method 8034, Periodate Oxidation Method for Manganese, Hach Handbook of Wastewater Analysis. 1979. Hach Company.
\24\ Methods for Analysis of Organic Substances in Water and Fluvial Sediments, Techniques of Water-Resources Investigations of the U.S. Geological
  Survey, Book 5, Chapter A3, (1972 Revised 1987). 1987. USGS.
\25\ Method 8507, Nitrogen, Nitrite-Low Range, Diazotization Method for Water and Wastewater. 1979. Hach Company.
\26\ Just prior to distillation, adjust the sulfuric-acid-preserved sample to pH 4 with 1 + 9 NaOH.
\27\ The colorimetric reaction must be conducted at a pH of 10.0  0.2.
\28\ Addison, R.F., and R.G. Ackman. 1970. Direct Determination of Elemental Phosphorus by Gas-Liquid Chromatography, Journal of Chromatography,
  47(3):421-426.
\29\ Approved methods for the analysis of silver in industrial wastewaters at concentrations of 1 mg/L and above are inadequate where silver exists as
  an inorganic halide. Silver halides such as the bromide and chloride are relatively insoluble in reagents such as nitric acid but are readily soluble
  in an aqueous buffer of sodium thiosulfate and sodium hydroxide to pH of 12. Therefore, for levels of silver above 1 mg/L, 20 mL of sample should be
  diluted to 100 mL by adding 40 mL each of 2 M Na2S2O3and NaOH. Standards should be prepared in the same manner. For levels of silver below 1 mg/L the
  approved method is satisfactory.
\30\ The use of EDTA decreases method sensitivity. Analysts may omit EDTA or replace with another suitable complexing reagent provided that all method-
  specified quality control acceptance criteria are met.
\31\ For samples known or suspected to contain high levels of silver (e.g., in excess of 4 mg/L), cyanogen iodide should be used to keep the silver in
  solution for analysis. Prepare a cyanogen iodide solution by adding 4.0 mL of concentrated NH4OH, 6.5 g of KCN, and 5.0 mL of a 1.0 N solution of I2
  to 50 mL of reagent water in a volumetric flask and dilute to 100.0 mL. After digestion of the sample, adjust the pH of the digestate to >7 to prevent
  the formation of HCN under acidic conditions. Add 1 mL of the cyanogen iodide solution to the sample digestate and adjust the volume to 100 mL with
  reagent water (NOT acid). If cyanogen iodide is added to sample digestates, then silver standards must be prepared that contain cyanogen iodide as
  well. Prepare working standards by diluting a small volume of a silver stock solution with water and adjusting the pH >7 with NH4OH. Add 1 mL of the
  cyanogen iodide solution and let stand 1 hour. Transfer to a 100-mL volumetric flask and dilute to volume with water.
\32\ ``Water Temperature-Influential Factors, Field Measurement and Data Presentation,'' Techniques of Water-Resources Investigations of the U.S.
  Geological Survey, Book 1, Chapter D1. 1975. USGS.
\33\ Method 8009, Zincon Method for Zinc, Hach Handbook of Water Analysis, 1979. Hach Company.
\34\ Method AES0029, Direct Current Plasma (DCP) Optical Emission Spectrometric Method for Trace Elemental Analysis of Water and Wastes. 1986-Revised
  1991. Thermo Jarrell Ash Corporation.
\35\ In-Situ Method 1004-8-2009, Carbonaceous Biochemical Oxygen Demand (CBOD) Measurement by Optical Probe. 2009. In-Situ Incorporated.
\36\ Microwave-assisted digestion may be employed for this metal, when analyzed by this methodology. Closed Vessel Microwave Digestion of Wastewater
  Samples for Determination of Metals. April 16, 1992. CEM Corporation
\37\ When determining boron and silica, only plastic, PTFE, or quartz laboratory ware may be used from start until completion of analysis.
\38\ Only use n-hexane (n-Hexane--85% minimum purity, 99.0% min. saturated C6 isomers, residue less than 1 mg/L) extraction solvent when determining Oil
  and Grease parameters--Hexane Extractable Material (HEM), or Silica Gel Treated HEM (analogous to EPA Methods 1664 Rev. A and 1664 Rev. B). Use of
  other extraction solvents is prohibited.
\39\ Method PAI-DK01, Nitrogen, Total Kjeldahl, Block Digestion, Steam Distillation, Titrimetric Detection. Revised December 22, 1994. OI Analytical.
\40\ Method PAI-DK02, Nitrogen, Total Kjeldahl, Block Digestion, Steam Distillation, Colorimetric Detection. Revised December 22, 1994. OI Analytical.
\41\ Method PAI-DK03, Nitrogen, Total Kjeldahl, Block Digestion, Automated FIA Gas Diffusion. Revised December 22, 1994. OI Analytical.
\42\ Method 1664 Rev. B is the revised version of EPA Method 1664 Rev. A. U.S. EPA. February 1999, Revision A. Method 1664, n-Hexane Extractable
  Material (HEM; Oil and Grease) and Silica Gel Treated n-Hexane Extractable Material (SGT-HEM; Non-polar Material) by Extraction and Gravimetry. EPA-
  821-R-98-002. U.S. EPA. February 2010, Revision B. Method 1664, n-Hexane Extractable Material (HEM; Oil and Grease) and Silica Gel Treated n-Hexane
  Extractable Material (SGT-HEM; Non-polar Material) by Extraction and Gravimetry. EPA-821-R-10-001.
\43\ Method 1631, Revision E, Mercury in Water by Oxidation, Purge and Trap, and Cold Vapor Atomic Fluorescence Spectrometry, EPA-821-R-02-019. Revision
  E. August 2002, U.S. EPA. The application of clean techniques described in EPA's Method 1669: Sampling Ambient Water for Trace Metals at EPA Water
  Quality Criteria Levels, EPA-821-R-96-011, are recommended to preclude contamination at low-level, trace metal determinations.
\44\ Method OIA-1677-09, Available Cyanide by Ligand Exchange and Flow Injection Analysis (FIA). 2010. OI Analytical.
\45\ Open File Report 00-170, Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Ammonium Plus
  Organic Nitrogen by a Kjeldahl Digestion Method and an Automated Photometric Finish that Includes Digest Cleanup by Gas Diffusion. 2000. USGS.
\46\ Open File Report 93-449, Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Chromium in Water by
  Graphite Furnace Atomic Absorption Spectrophotometry. 1993. USGS.
\47\ Open File Report 97-198, Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Molybdenum by
  Graphite Furnace Atomic Absorption Spectrophotometry. 1997. USGS.
\48\ Open File Report 92-146, Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Total Phosphorus by
  Kjeldahl Digestion Method and an Automated Colorimetric Finish That Includes Dialysis. 1992. USGS.
\49\ Open File Report 98-639, Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Arsenic and Selenium
  in Water and Sediment by Graphite Furnace-Atomic Absorption Spectrometry. 1999. USGS.
\50\ Open File Report 98-165, Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Elements in Whole-
  water Digests Using Inductively Coupled Plasma-Optical Emission Spectrometry and Inductively Coupled Plasma-Mass Spectrometry. 1998. USGS.
\51\ Open File Report 93-125, Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of Inorganic and
  Organic Constituents in Water and Fluvial Sediments. 1993. USGS.
\52\ Unless otherwise indicated, all EPA methods, excluding EPA Method 300.1, are published in U.S. EPA. May 1994. Methods for the Determination of
  Metals in Environmental Samples, Supplement I, EPA/600/R-94/111; or U.S. EPA. August 1993. Methods for the Determination of Inorganic Substances in
  Environmental Samples, EPA/600/R-93/100. EPA Method 300.1 is U.S. EPA. Revision 1.0, 1997, including errata cover sheet April 27, 1999. Determination
  of Inorganic Ions in Drinking Water by Ion Chromatography.
\53\ Styrene divinyl benzene beads (e.g., AMCO-AEPA-1 or equivalent) and stabilized formazin (e.g., Hach StablCal\TM\ or equivalent) are acceptable
  substitutes for formazin.
\54\ Method D6508-15, Test Method for Determination of Dissolved Inorganic Anions in Aqueous Matrices Using Capillary Ion Electrophoresis and Chromate
  Electrolyte. 2015. ASTM
\55\ Kelada-01, Kelada Automated Test Methods for Total Cyanide, Acid Dissociable Cyanide, and Thiocyanate, EPA 821-B-01-009, Revision 1.2, August 2001.
  US EPA. Note: A 450-W UV lamp may be used in this method instead of the 550-W lamp specified if it provides performance within the quality control
  (QC) acceptance criteria of the method in a given instrument. Similarly, modified flow cell configurations and flow conditions may be used in the
  method, provided that the QC acceptance criteria are met.
\56\ QuikChem Method 10-204-00-1-X, Digestion and Distillation of Total Cyanide in Drinking and Wastewaters using MICRO DIST and Determination of
  Cyanide by Flow Injection Analysis. Revision 2.2, March 2005. Lachat Instruments.
\57\ When using sulfide removal test procedures described in EPA Method 335.4-1, reconstitute particulate that is filtered with the sample prior to
  distillation.

\58\ Unless otherwise stated, if the language of this table specifies a sample digestion and/or distillation ``followed by'' analysis with a method,
  approved digestion and/or distillation are required prior to analysis.
\59\ Samples analyzed for available cyanide using OI Analytical method OIA-1677-09 or ASTM method D6888-16 that contain particulate matter may be
  filtered only after the ligand exchange reagents have been added to the samples, because the ligand exchange process converts complexes containing
  available cyanide to free cyanide, which is not removed by filtration. Analysts are further cautioned to limit the time between the addition of the
  ligand exchange reagents and sample filtration to no more than 30 minutes to preclude settling of materials in samples.
\60\ Analysts should be aware that pH optima and chromophore absorption maxima might differ when phenol is replaced by a substituted phenol as the color
  reagent in Berthelot Reaction (``phenol-hypochlorite reaction'') colorimetric ammonium determination methods. For example, when phenol is used as the
  color reagent, pH optimum and wavelength of maximum absorbance are about 11.5 and 635 nm, respectively--see, Patton, C.J. and S.R. Crouch. March 1977.
  Anal. Chem. 49:464-469. These reaction parameters increase to pH >12.6 and 665 nm when salicylate is used as the color reagent--see, Krom, M.D. April
  1980. The Analyst 105:305-316.
\61\ If atomic absorption or ICP instrumentation is not available, the aluminon colorimetric method detailed in the 19th Edition of Standard Methods for
  the Examination of Water and Wastewater may be used. This method has poorer precision and bias than the methods of choice.
\62\ Easy (1-Reagent) Nitrate Method, Revision November 12, 2011. Craig Chinchilla.
\63\ Hach Method 10360, Luminescence Measurement of Dissolved Oxygen in Water and Wastewater and for Use in the Determination of BOD5 and CBOD5.
  Revision 1.2, October 2011. Hach Company. This method may be used to measure dissolved oxygen when performing the methods approved in Table IB for
  measurement of biochemical oxygen demand (BOD) and carbonaceous biochemical oxygen demand (CBOD).
\64\ In-Situ Method 1002-8-2009, Dissolved Oxygen (DO) Measurement by Optical Probe. 2009. In-Situ Incorporated.
\65\ Mitchell Method M5331, Determination of Turbidity by Nephelometry. Revision 1.0, July 31, 2008. Leck Mitchell.
\66\ Mitchell Method M5271, Determination of Turbidity by Nephelometry. Revision 1.0, July 31, 2008. Leck Mitchell.
\67\ Orion Method AQ4500, Determination of Turbidity by Nephelometry. Revision 5, March 12, 2009. Thermo Scientific.
\68\ EPA Method 200.5, Determination of Trace Elements in Drinking Water by Axially Viewed Inductively Coupled Plasma-Atomic Emission Spectrometry, EPA/
  600/R-06/115. Revision 4.2, October 2003. US EPA.
\69\ Method 1627, Kinetic Test Method for the Prediction of Mine Drainage Quality, EPA-821-R-09-002. December 2011. US EPA.
\70\ Techniques and Methods Book 5-B1, Determination of Elements in Natural-Water, Biota, Sediment and Soil Samples Using Collision/Reaction Cell
  Inductively Coupled Plasma-Mass Spectrometry, Chapter 1, Section B, Methods of the National Water Quality Laboratory, Book 5, Laboratory Analysis,
  2006. USGS.
\71\ Water-Resources Investigations Report 01-4132, Methods of Analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination
  of Organic Plus Inorganic Mercury in Filtered and Unfiltered Natural Water with Cold Vapor-Atomic Fluorescence Spectrometry, 2001. USGS.
\72\ USGS Techniques and Methods 5-B8, Chapter 8, Section B, Methods of the National Water Quality Laboratory Book 5, Laboratory Analysis, 2011 USGS
\73\ NECi Method N07-0003, ''Nitrate Reductase Nitrate-Nitrogen Analysis,'' Revision 9.0, March 2014, The Nitrate Elimination Co., Inc.
\74\ Timberline Instruments, LLC Method Ammonia-001, ``Determination of Inorganic Ammonia by Continuous Flow Gas Diffusion and Conductivity Cell
  Analysis,'' June 2011, Timberline Instruments, LLC.
\75\ Hach Company Method 10206, ``Spectrophotometric Measurement of Nitrate in Water and Wastewater,'' Revision 2.1, January 2013, Hach Company.
\76\ Hach Company Method 10242, ``Simplified Spectrophotometric Measurement of Total Kjeldahl Nitrogen in Water and Wastewater,'' Revision 1.1, January
  2013, Hach Company.
\77\ National Council for Air and Stream Improvement (NCASI) Method TNTP-W10900, ``Total (Kjeldahl) Nitrogen and Total Phosphorus in Pulp and Paper
  Biologically Treated Effluent by Alkaline Persulfate Digestion,'' June 2011, National Council for Air and Stream Improvement, Inc.
\78\ The pH adjusted sample is to be adjusted to 7.6 for NPDES reporting purposes.
\79\ I-2057-85 U.S. Geological Survey Techniques of Water-Resources Investigations, Book 5, Chap. A11989, Methods for Determination of Inorganic
  Substances in Water and Fluvial Sediments, 1989.
\80\ Methods I-2522-90, I-2540-90, and I-2601-90 U.S. Geological Survey Open-File Report 93-125, Methods of Analysis by the U.S. Geological Survey
  National Water Quality Laboratory-Determination of Inorganic and Organic Constituents in Water and Fluvial Sediments, 1993.
\81\ Method I-1472-97, U.S. Geological Survey Open-File Report 98-165, Methods of Analysis by the U.S. Geological Survey National Water Quality
  Laboratory-Determination of Inorganic and Organic Constituents in Water and Fluvial Sediments, 1998.
\82\ FIAlab Instruments, Inc. Method FIAlab 100, ``Determination of Inorganic Ammonia by Continuous Flow Gas Diffusion and Fluorescence Detector
  Analysis'', April 4, 2018, FIAlab Instruments, Inc.
\83\ MACHEREY-NAGEL GmbH and Co. Method 036/038 NANOCOLOR[supreg] COD LR/HR, ``Spectrophotometric Measurement of Chemical Oxygen Demand in Water and
  Wastewater'', Revision 1.5, May 2008, MACHEREY-NAGEL GmbH and Co. KG.
\84\ Please refer to the following applicable Quality Control Sections: Part 2000 Methods, Physical and Aggregate Properties 2020 (2017); Part 3000
  Methods, Metals, 3020 (2017); Part 4000 Methods, Inorganic Nonmetallic Constituents, 4020 (2014); Part 5000 Methods, and Aggregate Organic
  Constituents, 5020 (2017). These Quality Control Standards are available for download at www.standardmethods.org at no charge.

                                     Table IC--List of Approved Test Procedures for Non-Pesticide Organic Compounds
--------------------------------------------------------------------------------------------------------------------------------------------------------
          Parameter \1\                    Method                  EPA 2 7              Standard methods               ASTM                  Other
--------------------------------------------------------------------------------------------------------------------------------------------------------
1. Acenaphthene.................  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
2. Acenaphthylene...............  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
3. Acrolein.....................  GC.....................  603....................
                                  GC/MS..................  624.1 \4\, 1624B.......
4. Acrylonitrile................  GC.....................  603....................
                                  GC/MS..................  624.1 \4\, 1624B.......  .......................  .......................  O-4127-96.\13\
5. Anthracene...................  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440B-2005.............  D4657-92 (98)..........
6. Benzene......................  GC.....................  602....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
7. Benzidine....................  Spectro-photometric....  .......................  .......................  .......................  See footnote \3\,
                                                                                p. 1.
                                  GC/MS..................  625.1 \5\, 1625B.......  6410 B-2000............
                                  HPLC...................  605....................
8. Benzo(a)anthracene...........  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
9. Benzo(a)pyrene...............  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
10. Benzo(b)fluoranthene........  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
11. Benzo(g,h,i)perylene........  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
12. Benzo(k)fluoranthene........  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
13. Benzyl chloride.............  GC.....................  .......................  .......................  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  .......................  .......................  .......................  See footnote \6\,
                                                                                p. S102.

14. Butyl benzyl phthalate......  GC.....................  606....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
15. bis(2-Chloroethoxy) methane.  GC.....................  611....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
16. bis(2-Chloroethyl) ether....  GC.....................  611....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
17. bis(2-Ethylhexyl) phthalate.  GC.....................  606....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
18. Bromodichloromethane........  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
19. Bromoform...................  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
20. Bromomethane................  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
21. 4-Bromophenyl phenyl ether..  GC.....................  611....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
22. Carbon tetrachloride........  GC.....................  601....................  6200 C-2011............  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
23. 4-Chloro-3-methyl phenol....  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
24. Chlorobenzene...............  GC.....................  601, 602...............  6200 C-2011............  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
25. Chloroethane................  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96.\13\
26. 2-Chloroethylvinyl ether....  GC.....................  601....................
                                  GC/MS..................  624.1, 1624B...........
27. Chloroform..................  GC.....................  601....................  6200 C-2011............  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
28. Chloromethane...............  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
29. 2-Chloronaphthalene.........  GC.....................  612....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
30. 2-Chlorophenol..............  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
31. 4-Chlorophenyl phenyl ether.  GC.....................  611....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
32. Chrysene....................  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
33. Dibenzo(a,h)anthracene......  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
34. Dibromochloromethane........  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
35. 1,2-Dichlorobenzene.........  GC.....................  601, 602...............  6200 C-2011............
                                  GC/MS..................  624.1, 1625B...........  6200 B-2011............  .......................  See footnote \9\,
                                                                                p. 27; O-4127-96
                                                                                \13\, O-4436-
                                                                                16.\14\
36. 1,3-Dichlorobenzene.........  GC.....................  601, 602...............  6200 C-2011............
                                  GC/MS..................  624.1, 1625B...........  6200 B-2011............  .......................  See footnote \9\,
                                                                                p. 27; O-4127-
                                                                                96.\13\
37. 1,4-Dichlorobenzene.........  GC.....................  601, 602...............  6200 C-2011............
                                  GC/MS..................  624.1, 1625B...........  6200 B-2011............  .......................  See footnote \9\,
                                                                                p. 27; O-4127-96
                                                                                \13\, O-4436-
                                                                                16.\14\
38. 3,3'-Dichlorobenzidine......  GC/MS..................  625.1, 1625B...........  6410 B-2000............
                                  HPLC...................  605....................
39. Dichlorodifluoromethane.....  GC.....................  601....................
                                  GC/MS..................  .......................  6200 C-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
40. 1,1-Dichloroethane..........  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
41. 1,2-Dichloroethane..........  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
42. 1,1-Dichloroethene..........  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
43. trans-1,2-Dichloroethene....  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
44. 2,4-Dichlorophenol..........  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
45. 1,2-Dichloropropane.........  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
46. cis-1,3-Dichloropropene.....  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
47. trans-1,3-Dichloropropene...  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
48. Diethyl phthalate...........  GC.....................  606....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
49. 2,4-Dimethylphenol..........  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
50. Dimethyl phthalate..........  GC.....................  606....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
51. Di-n-butyl phthalate........  GC.....................  606....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
52. Di-n-octyl phthalate........  GC.....................  606....................

                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
53. 2,4-Dinitrophenol...........  GC.....................  604....................  6420 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............
54. 2,4-Dinitrotoluene..........  GC.....................  609....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
55. 2,6-Dinitrotoluene..........  GC.....................  609....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
56. Epichlorohydrin.............  GC.....................  .......................  .......................  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  .......................  .......................  .......................  See footnote \6\,
                                                                                p. S102.
57. Ethylbenzene................  GC.....................  602....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
58. Fluoranthene................  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
59. Fluorene....................  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
60. 1,2,3,4,6,7,8-Heptachloro-    GC/MS..................  1613B..................
 dibenzofuran.
61. 1,2,3,4,7,8,9-Heptachloro-    GC/MS..................  1613B..................
 dibenzofuran.
62. 1,2,3,4,6,7,8-Heptachloro-    GC/MS..................  1613B..................
 dibenzo-p-dioxin.
63. Hexachlorobenzene...........  GC.....................  612....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
64. Hexachlorobutadiene.........  GC.....................  612....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27; O-4127-
                                                                                96.\13\
65. Hexachlorocyclopentadiene...  GC.....................  612....................
                                  GC/MS..................  625.1 \5\, 1625B.......  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27; O-4127-
                                                                                96.\13\
66. 1,2,3,4,7,8-Hexachloro-       GC/MS..................  1613B..................
 dibenzofuran.
67. 1,2,3,6,7,8-Hexachloro-       GC/MS..................  1613B..................
 dibenzofuran.
68. 1,2,3,7,8,9-Hexachloro-       GC/MS..................  1613B..................
 dibenzofuran.
69. 2,3,4,6,7,8-Hexachloro-       GC/MS..................  1613B..................
 dibenzofuran.
70. 1,2,3,4,7,8-Hexachloro-       GC/MS..................  1613B..................
 dibenzo-p-dioxin.
71. 1,2,3,6,7,8-Hexachloro-       GC/MS..................  1613B..................
 dibenzo-p-dioxin.
72. 1,2,3,7,8,9-Hexachloro-       GC/MS..................  1613B..................
 dibenzo-p-dioxin.
73. Hexachloroethane............  GC.....................  612....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27; O-4127-
                                                                                96.\13\
74. Indeno(1,2,3-c,d) pyrene....  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
75. Isophorone..................  GC.....................  609....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
76. Methylene chloride..........  GC.....................  601....................  6200 C-2011............  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
77. 2-Methyl-4,6-dinitrophenol..  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
78. Naphthalene.................  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............
79. Nitrobenzene................  GC.....................  609....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  .......................  .......................  D4657-92 (98)..........
80. 2-Nitrophenol...............  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
81. 4-Nitrophenol...............  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
82. N-Nitrosodimethylamine......  GC.....................  607....................
                                  GC/MS..................  625.1 \5\, 1625B.......  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
83. N-Nitrosodi-n-propylamine...  GC.....................  607....................
                                  GC/MS..................  625.1 \5\, 1625B.......  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
84. N-Nitrosodiphenylamine......  GC.....................  607....................
                                  GC/MS..................  625.1 \5\, 1625B.......  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
85. Octachlorodibenzofuran......  GC/MS..................  1613B \10\.............
86. Octachlorodibenzo-p-dioxin..  GC/MS..................  1613B \10\.............
87. 2,2'-oxybis(1-chloropropane)  GC.....................  611....................
 \12\ [also known as bis(2-
 Chloro-1-methylethyl) ether].
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
88. PCB-1016....................  GC.....................  608.3..................  .......................  .......................  See footnote \3\,
                                                                                p. 43; See
                                                                                footnote.\8\
                                  GC/MS..................  625.1..................  6410 B-2000............
89. PCB-1221....................  GC.....................  608.3..................  .......................  .......................  See footnote \3\,
                                                                                p. 43; See
                                                                                footnote.\8\
                                  GC/MS..................  625.1..................  6410 B-2000............
90. PCB-1232....................  GC.....................  608.3..................  .......................  .......................  See footnote \3\,
                                                                                p. 43; See
                                                                                footnote.\8\

                                  GC/MS..................  625.1..................  6410 B-2000............
91. PCB-1242....................  GC.....................  608.3..................  .......................  .......................  See footnote \3\,
                                                                                p. 43; See
                                                                                footnote.\8\
                                  GC/MS..................  625.1..................  6410 B-2000............
92. PCB-1248....................  GC.....................  608.3..................  .......................  .......................  See footnote \3\,
                                                                                p. 43; See
                                                                                footnote.\8\
                                  GC/MS..................  625.1..................  6410 B-2000............
93. PCB-1254....................  GC.....................  608.3..................  .......................  .......................  See footnote \3\,
                                                                                p. 43; See
                                                                                footnote.\8\
                                  GC/MS..................  625.1..................  6410 B-2000............
94. PCB-1260....................  GC.....................  608.3..................  .......................  .......................  See footnote \3\,
                                                                                p. 43; See
                                                                                footnote.\8\
                                  GC/MS..................  625.1..................  6410 B-2000............
95. 1,2,3,7,8-Pentachloro-        GC/MS..................  1613B..................
 dibenzofuran.
96. 2,3,4,7,8-Pentachloro-        GC/MS..................  1613B..................
 dibenzofuran.
97. 1,2,3,7,8-Pentachloro-        GC/MS..................  1613B..................
 dibenzo-p-dioxin.
98. Pentachlorophenol...........  GC.....................  604....................  6420 B-2000............  .......................  See footnote \3\,
                                                                                p. 140.
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
99. Phenanthrene................  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
100. Phenol.....................  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
101. Pyrene.....................  GC.....................  610....................
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
                                  HPLC...................  610....................  6440 B-2005............  D4657-92 (98)..........
102. 2,3,7,8-Tetrachloro-         GC/MS..................  1613B \10\.............
 dibenzofuran.
103. 2,3,7,8-Tetrachloro-dibenzo- GC/MS..................  613, 625.1 \5a\, 1613B.
 p-dioxin.
104. 1,1,2,2-Tetrachloroethane..  GC.....................  601....................  6200 C-2011............  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96.\13\
105. Tetrachloroethene..........  GC.....................  601....................  6200 C-2011............  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
106. Toluene....................  GC.....................  602....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
107. 1,2,4-Trichlorobenzene.....  GC.....................  612....................  .......................  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27; O-4127-96
                                                                                \13\, O-4436-
                                                                                16.\14\
108. 1,1,1-Trichloroethane......  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
109. 1,1,2-Trichloroethane......  GC.....................  601....................  6200 C-2011............  .......................  See footnote \3\,
                                                                                p. 130.
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
110. Trichloroethene............  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
111. Trichlorofluoromethane.....  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1..................  6200 B-2011............  .......................  O-4127-96.\13\
112. 2,4,6-Trichlorophenol......  GC.....................  604....................  6420 B-2000............
                                  GC/MS..................  625.1, 1625B...........  6410 B-2000............  .......................  See footnote \9\,
                                                                                p. 27.
113. Vinyl chloride.............  GC.....................  601....................  6200 C-2011............
                                  GC/MS..................  624.1, 1624B...........  6200 B-2011............  .......................  O-4127-96 \13\, O-
                                                                                4436-16.\14\
114. Nonylphenol................  GC/MS..................  .......................  .......................  D7065-17...............
115. Bisphenol A (BPA)..........  GC/MS..................  .......................  .......................  D7065-17...............
116. p-tert-Octylphenol (OP)....  GC/MS..................  .......................  .......................  D7065-17...............
117. Nonylphenol Monoethoxylate   GC/MS..................  .......................  .......................  D7065-17...............
 (NP1EO).
118. Nonylphenol Diethoxylate     GC/MS..................  .......................  .......................  D7065-17...............
 (NP2EO).
119. Adsorbable Organic Halides   Adsorption and           1650 \11\..............
 (AOX).                            Coulometric Titration.
120. Chlorinated Phenolics......  In Situ Acetylation and  1653 \11\..............
                                   GC/MS.
--------------------------------------------------------------------------------------------------------------------------------------------------------
Table IC notes:
\1\ All parameters are expressed in micrograms per liter ([micro]g/L) except for Method 1613B, in which the parameters are expressed in picograms per
  liter (pg/L).
\2\ The full text of Methods 601-613, 1613B, 1624B, and 1625B are provided at appendix A, Test Procedures for Analysis of Organic Pollutants. The
  standardized test procedure to be used to determine the method detection limit (MDL) for these test procedures is given at appendix B of this part,
  Definition and Procedure for the Determination of the Method Detection Limit. These methods are available at: https://www.epa.gov/cwa-methods as
  individual PDF files.
\3\ Methods for Benzidine: Chlorinated Organic Compounds, Pentachlorophenol and Pesticides in Water and Wastewater. September 1978. U.S. EPA.
\4\ Method 624.1 may be used for quantitative determination of acrolein and acrylonitrile, provided that the laboratory has documentation to
  substantiate the ability to detect and quantify these analytes at levels necessary to comply with any associated regulations. In addition, the use of
  sample introduction techniques other than simple purge-and-trap may be required. QC acceptance criteria from Method 603 should be used when analyzing
  samples for acrolein and acrylonitrile in the absence of such criteria in Method 624.1.
\5\ Method 625.1 may be extended to include benzidine, hexachlorocyclopentadiene, N-nitrosodimethylamine, N-nitrosodi-n-propylamine, and N-
  nitrosodiphenylamine. However, when they are known to be present, Methods 605, 607, and 612, or Method 1625B, are preferred methods for these
  compounds.
\5a\ Method 625.1 screening only.
\6\ Selected Analytical Methods Approved and Cited by the United States Environmental Protection Agency, Supplement to the 15th Edition of Standard
  Methods for the Examination of Water and Wastewater. 1981. American Public Health Association (APHA).
\7\ Each analyst must make an initial, one-time demonstration of their ability to generate acceptable precision and accuracy with Methods 601-603,
  1624B, and 1625B in accordance with procedures in Section 8.2 of each of these methods. Additionally, each laboratory, on an on-going basis must spike
  and analyze 10% (5% for Methods 624.1 and 625.1 and 100% for methods 1624B and 1625B) of all samples to monitor and evaluate laboratory data quality
  in accordance with Sections 8.3 and 8.4 of these methods. When the recovery of any parameter falls outside the quality control (QC) acceptance
  criteria in the pertinent method, analytical results for that parameter in the unspiked sample are suspect. The results should be reported but cannot
  be used to demonstrate regulatory compliance. If the method does not contain QC acceptance criteria, control limits of  three standard
  deviations around the mean of a minimum of five replicate measurements must be used. These quality control requirements also apply to the Standard
  Methods, ASTM Methods, and other methods cited.

\8\ Organochlorine Pesticides and PCBs in Wastewater Using Empore\TM\ Disk. Revised October 28, 1994. 3M Corporation.
\9\ Method O-3116-87 is in Open File Report 93-125, Methods of Analysis by U.S. Geological Survey National Water Quality Laboratory--Determination of
  Inorganic and Organic Constituents in Water and Fluvial Sediments. 1993. USGS.
\10\ Analysts may use Fluid Management Systems, Inc. Power-Prep system in place of manual cleanup provided the analyst meets the requirements of Method
  1613B (as specified in Section 9 of the method) and permitting authorities. Method 1613, Revision B, Tetra- through Octa-Chlorinated Dioxins and
  Furans by Isotope Dilution HRGC/HRMS. Revision B, 1994. U.S. EPA. The full text of this method is provided in appendix A to this part and at https://www.epa.gov/cwa-methods/approved-cwa-test-methods-organic-compounds.
\11\ Method 1650, Adsorbable Organic Halides by Adsorption and Coulometric Titration. Revision C, 1997 U.S. EPA. Method 1653, Chlorinated Phenolics in
  Wastewater by In Situ Acetylation and GCMS. Revision A, 1997 U.S. EPA. The full text for both of these methods is provided at appendix A in part 430
  of this chapter, The Pulp, Paper, and Paperboard Point Source Category.
\12\ The compound was formerly inaccurately labeled as 2,2'-oxybis(2-chloropropane) and bis(2-chloroisopropyl) ether. Some versions of Methods 611, and
  1625 inaccurately list the analyte as ``bis(2-chloroisopropyl)ether,'' but use the correct CAS number of 108-60-1.
\13\ Method O-4127-96, U.S. Geological Survey Open-File Report 97-829, Methods of analysis by the U.S. Geological Survey National Water Quality
  Laboratory--Determination of 86 volatile organic compounds in water by gas chromatography/mass spectrometry, including detections less than reporting
  limits,1998, USGS.
\14\ Method O-4436-16 U.S. Geological Survey Techniques and Methods, book 5, chap. B12, Determination of heat purgeable and ambient purgeable volatile
  organic compounds in water by gas chromatography/mass spectrometry, 2016, USGS.

* * * * *

                                          Table IH--List of Approved Microbiological Methods for Ambient Water
--------------------------------------------------------------------------------------------------------------------------------------------------------
        Parameter and units               Method \1\                EPA              Standard methods      AOAC, ASTM, USGS              Other
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                        Bacteria
--------------------------------------------------------------------------------------------------------------------------------------------------------
1. Coliform (fecal), number per     Most Probable Number   p. 132 \3\...........  9221 E-2014, 9221 F.2-
 100 mL.                             (MPN), 5 tube, 3                              2014 \32\.
                                     dilution, or.
                                    Membrane filter (MF)   p. 124 \3\...........  9222 D-2015 \26\.....  B-0050-85 \4\.......
                                     \2\, single step.
2. Coliform (total), number per     MPN, 5 tube, 3         p. 114 \3\...........  9221 B-2014..........