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Halogenated Aromatics
Chlorobenzene
Chlorobenzene finds uses as a feedstock for chloronitrobenzene and aniline manufacture, a solvent carrier for methylene diisocyanate, a solvent, a pesticide intermediate, and for heat transfer (Lewis 2007).
EPA's Toxics Release Inventory reports that 546,011 pounds of chlorobenzene were released or disposed of in 2007. The law does not require all facilities to report, so this is a minimum estimate. Most of the releases were reported as point source or fugitive emissions to the air (455,426 pounds).
In a U.S. Geological Survey nationwide assessment of water quality in public and private water wells, chlorobenzene was detected in both domestic and public supply wells at very low levels, with none exceeding EPA's maximum contaminant level (MCL) of 100 µg/L in drinking water. Chlorobenzene was detected in 0.41 percent of samples taken from aquifers, also at very low levels (Zogorski et al. 2006).
References
Chlorobenzene, CASRN: 108-90-7
Hazardous Substances Data Bank (HSDB)
TOXNET, National Library of Medicine Web site.
Hawley's Condensed Chemical Dictionary, 15th Edition
Lewis, R.J.
Wiley, New York. ISBN: 978-0-471-76865-4, p 277, 2007
The Quality of Our Nation's Waters: Volatile Organic Compounds in the Nation's Ground Water and Drinking-Water Supply Wells
Zogorski, John, Janet M. Carter, Tamara Ivahnenko, Wayne W. Lapham, Michael J. Moran, Barbara L. Rowe, Paul J. Squillace, and Patricia L. Toccalino
U.S. Geological Survey, USGS Circular 1292, 2006, 112 pp
Toxicological Profile for Chlorobenzene
Agency for Toxic Substances and Disease Registry (ATSDR), 100 pp, 1990
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