EPA Methods  From Wikipedia, the free encyclopedia Jump to:
navigation, search  The United States Environmental Protection
Agency (EPA) maintains test methods, which are approved
procedures for measuring the presence and concentration of
physical and chemical pollutants; evaluating properties, such as
toxic properties, of chemical substances; or measuring the
effects of substances under various conditions. The methods in
the Agency index are known as EPA Methods.[1] There are other
types of methods such as the ASTM and United States
Pharmacopeia, but the EPA Methods are the most widely accepted
and used.  Cân bằng PTHH.png   The method numbers generally
range from 1 to 9000 and may have modification letters appended
to the end, signifying a newer version of the method has been
released. Some ranges of numbers appear to be organized with
intention, for example methods 1-99 being air methods or the
7000s being for hazardous waste.[2] Others number ranges,
however, seem to only contain random methods, like the 3