Noun
BTEX (uncountable)
Initialism of benzene, toluene, ethylbenzene, and ortho-, meta-, and para- xylenes: toxic VOCs commonly found together, used in the chemical analysis of air and water to determine their quality and purity.
The introduction of benzene and other volatile organic compounds (collectively BTEX ) to the subterranean environment compounds the threat posed by a pipeline leak. Source: Internet