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total petroleum hydrocarbon
Total petroleum 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.〔(Total Petroleum Hydrocarbons ) at Agency for Toxic Substances and Disease Registry,. CDC〕 Petroleum Hydrocarbon Ranges are monitored at various levels depending on the state and testing site.〔() Petroleum Hydrocarbon Ranges〕
TPH is the sum of VPH and EPH. VPH refers to volatile petroleum hydrocarbons (VPH) also known as petrol range organics (PRO) and includes hydrocarbons from C2-C5. EPH refers to extractable petroleum hydrocarbons (EPH)also known as Diesel range organics (DRO) and includes hydrocarbons from C6-C40.
Various methods to analyze the components of TPH are introduced in a Nordic report.〔(Use of Ozone Depleting Substances in Laboratories. TemaNord 516/2003 )〕 The report evaluates critically various new methods replacing the old ones using banned ozone depleting substances.
==References==
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