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hydrocarbon (TPH) is a term used for any mixture of hydrocarbons
that are found in crude oil. There are several hundred of these
compounds, but not all occur in any one sample. Crude oil is
used to make petroleum products which can contaminate the
environment. Because there are so many different chemicals in
crude oil and in other petroleum products, it is not practical
to measure each one separately. However, it is useful to measure
the total amount of TPH at a site. Chemicals that occur in TPH
include hexane, benzene, toluene, xylenes, naphthalene, and
fluorene, other constituents of gasoline, of jet fuels, of
mineral oils, and of other petroleum products.[1] Petroleum
Hydrocarbon Ranges are monitored at various levels depending on
the state and testing site.[2] TPH is the sum of VPH and EPH.
VPH refers to volatile petroleum hydrocarbons (VPH) also known
as petrol range organics (PRO) and includes