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 ?
Aroclor 1,221 [A1221; a weakly estrogenic industrial mixture of PCBs (Frame, 1997)] and the fungicide VIN [antiandrogenic (Gray et al., 2001)] were selected because of their different downstream signaling actions, evidence for direct and intergenerational effects, and to make comparisons with past work in our lab.
PCBs occur as a mixture of congeners, which were sold commercially as Aroclors. Method 608 lists seven separate PCBs that must be analyzed.
Present study is aimed at assessing whether PCB (Aroclor 1242) had any potential to cause negative effects on certain reproductive parameters of female freshwater cyprinid fish, Cyprinion watsoni.
Moore, Comparative Carcinogenicity in Sprague- Dawlley Rats of the Polychlorinated Biphenyl Mixtures Aroclors 1016, 1242, 1254 and 1260., Toxicological Sciences, 41, 62 (1998).
Key words: Aroclors; diluent; diluent oil; PCBs; Reference Materials; transformer oil.
PCBs (Aroclor 1254) in fish tissues throughout the State of New Jersey: a comprehensive survey.
There were no significant peaks at retention times of four minutes to eight minutes, indicating that low-chlorinated PCBs (i.e., Aroclors 1221, 1232, 1242, 1016, and 1248) were not present in any of the fish tissues.
Because Aroclors are often run on the same instrument as chlorinated pesticides or other halogenated compounds, it is important to minimize carryover between injections by baking off contaminants or residual sample.
For the organic components, these include six individual Aroclors in a water-soluble solvent (methanol) and the same six individual Aroclors in transformer oil (Table 1).
(2010) developed a PCB mixture resembling the average congener profile in Chicago air by combining Aroclors 1242 and 1254.
(36.) Testing forPCB Congeners & Aroclors [website].
(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.