polychlorinated biphenyl

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Related to Aroclors: Pcbs

polychlorinated biphenyl

or

PCB,

any of a group of organic compounds originally widely used in industrial processes but later found to be dangerous environmental pollutants. Polychlorinated biphenyl is a fat-soluble, water-insoluble hydrocarbon containing chlorine. It is extremely stable, withstanding temperatures of up to 1,600°F; (870°C;), is fire-resistant, and has been used as a heat-transfer and insulating fluid in cooling systems and electrical equipment; it has also been used in sealants, rubber, paints, plastics, printing ink, and insecticides. The chemical has entered the environment largely as a pollutant from equipment leaks, the weathering of many materials that contain PCB, and through interaction with food products. PCBs are not readily biodegradable. Production has been banned in several industrialized countries; the United States stopped producing PCBs in 1977.

polychlorinated biphenyl

[¦päl·i′klȯr·ə‚nād·əd bī′fen·əl]
(organic chemistry)
Any member of the group of chlorinated isomers of biphenyl. Abbreviated PCB.
References in periodicals archive ?
The problem is that PCBs can weather at different rates, thereby affecting pattern recognition, and cause analysts to report Aroclors as not detected.
In early quiescent period (August/September), the fish were exposed to 10, 30 and 50mg Aroclor 1242 per kg body weight for 30 days.
Moore, Comparative Carcinogenicity in Sprague- Dawlley Rats of the Polychlorinated Biphenyl Mixtures Aroclors 1016, 1242, 1254 and 1260.
RM 8504, Transformer Oil, is intended to be used as a diluent oil with transformer oil Standard Reference Materials (SRMs) 3075 to 3080 and SRM 3090 [1] when developing and validating methods for the determination of polychlorinated biphenyls (PCBs) as Aroclors (1) in transformer oil or similar matrices.
Aroclors 1221, 1232, 1242, 1016, and 1248) were not present in any of the fish tissues.
Certain health risks of PCBs were almost immediately apparent as workers making Aroclors suffered severe skin damage.
Comparison of effects of Aroclors 1016 and 1260 on non-human primate catecholamine function.
PCBs are commonly tested in addition to chlorinated pesticides, and are analyzed either as individual congeners, or as Aroclors (a trade name of several different PCB mixtures).
Six additional SRMs of the same Aroclors in transformer oil have also been prepared.
1985) studied 194 capacitor workers exposed to Aroclors (industrial mixtures of PCBs) before and after the plant discontinued use of PCBs and found abnormally high lymphocyte counts, defined as > 2 SDs from the internal age- and sex-adjusted standards used by the clinical laboratory, among workers before PCB discontinuation.
For example, Monsanto marketed Aroclors 1221, 1231, and 1242 up to 1268, which contain, respectively, 21%, 31%, and 42% to 68% chlorine by weight.