BTEX (Benzene, Toluene, Ethylbenzene, Xylenes)
A group of volatile organic compounds commonly found in petroleum products and frequently detected at LUST sites.
BTEX is an acronym for benzene, toluene, ethylbenzene, and xylenes — four volatile organic compounds (VOCs) that are naturally occurring components of petroleum products like gasoline and diesel fuel. These compounds are among the most frequently detected contaminants at leaking underground storage tank sites.
Of the four BTEX compounds, benzene is the most hazardous due to its classification as a known human carcinogen. The EPA has set a Maximum Contaminant Level (MCL) of 5 parts per billion for benzene in drinking water. Toluene, ethylbenzene, and xylenes have higher MCLs but still pose health risks at elevated concentrations.
BTEX compounds are relatively mobile in groundwater but are also susceptible to natural biodegradation under favorable conditions. Remediation strategies at LUST sites often target BTEX removal through techniques like soil vapor extraction, air sparging, and enhanced bioremediation. Monitoring of BTEX concentrations is a standard component of corrective action programs at petroleum-contaminated sites.
Related Terms
Environmental pollution by benzene, a carcinogenic compound found in gasoline and commonly detected at LUST sites.
Groundwater ContaminationThe pollution of underground water sources by petroleum products or hazardous substances from leaking USTs or other sources.
Petroleum ContaminationEnvironmental pollution caused by the release of petroleum products such as gasoline, diesel, and heating oil from UST systems.
RemediationThe process of cleaning up contaminated soil, groundwater, or other environmental media at a LUST or hazardous waste site.