| polychlorinated biphenyls |
are a group of synthetic organic chemicals that can cause a number of harmful effects. PCBs were used widely as coolants and lubricants for transformers, capacitors, and other electrical equipment. Some PCBs are volatile and may exist as a vapor in the air. PCBs enter the environment as mixtures containing a variety of individual chlorinated biphenyl components.
출처: www.afrpa.hq.af.mil/kelly/Williams/glossary.htm
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| polychlorinated biphenyls |
PCBs form a group of compounds which were developed in the 1930s and were mainly used in the electricity supply industry and mining. Due to their accumulation in the food chain, production of PCBs was halted world-wide at the beginning of the 1980s and in 1996 an EC Directive was agreed requiring a phase-out of continuing uses (mainly in ageing electrical equipment). PCBs are, however, still found in trace concentrations in the sea and in the fatty tissue of marine animals.
출처: www.eurochlor.org/tools/glossary/glossary.htm
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| polychlorinated biphenyls |
A class of chlorinated aromatic compounds composed of two fused benzene rings and two or more chlorine atoms; used in heat exchange, insulating fluids and other applications. There are 209 different PCBs. 2) A group of manufactured chemicals including 209 different, but closely related, compounds of carbon, hydrogen, and chlorine. If released to the environment, they persist for long periods of time and can biomagnify in the food web. ...
출처: response.restoration.noaa.gov/cpr/watershed/calcas...
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| polychlorinated biphenyls |
a group of synthetic, toxic industrial chemical compounds once used in making paint and electrical transformers, which are chemically inert and not biodegradable. PCBs were frequently found in industrial wastes, and subsequently found their way into surface and ground waters. As a result of their persistence, they tend to accumulate in the environment. In terms of streams and rivers, PCBs are drawn to sediment, to which they attach and can remain virtually indefinitely. ...
출처: mvhs1.mbhs.edu/riverweb/glossary.html
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| polychlorinated biphenyls |
A series of hazardous compounds used for a number of industrial purposes. PCBs are toxic to some marine life at concentrations of a few parts per billion and are known to cause skin diseases and even death in humans at higher concentrations. PCBs are persistent in the environment and do not decompose easily. ...
출처: www.lehigh.edu/~kaf3/books/reporting/glossary.html
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