BTEX refers to the group of compounds: benzene, toluene, ethylbenzene, and total xylenes which are naturally occurring components of petroleum that end up largely in gasoline as a result of the refining process. Refineries adjust the amounts of these compounds to meet vapor pressure and octane standards for gasoline.
Benzene is a volatile organic compound. It is used in the production of synthetic materials and consumer products such as synthetic rubber, plastics, nylon, insecticides, paints, dyes, resins, and cosmetics.
Toluene occurs naturally as a component of many petroleum products. Toluene is used as a solvent for paints, coatings, gums, oils, and resins.
Ethylbenzene is used mostly as a gasoline and aviation fuel additive. It may also be present in consumer products such as paints, inks, plastics, and pesticides.
There are three forms of xylene: ortho-, meta-, and para-. Ortho-xylene is the only naturally occurring form, the other two being man-made. Xylenes are used in gasoline and as a solvent in printing, rubber, and leather industries.
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