polychlorinated biphenyl


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Related to polychlorinated biphenyl: PCB

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 ?
Comparison of polychlorinated biphenyl levels across studies of human neurodevelopment.
The effects of polychlorinated biphenyl on selected endocrine parameters, and biochemical and behavioral neurological function in Sprague-Dawley rat pups and adults [unpublished dissertation].
(2002) have shown that Flemish adolescents exposed to polychlorinated biphenyls (PCBs) and dioxins are more susceptible to infectious diseases.
In her speech, Aziza Hamrouni Kerrou, national coordinator of PCB management activities, said that "ANGED is working on the implementation of a national plan for the elimination of PCBs through the rational and ecological management of electrical equipment and waste containing or contaminated with polychlorinated biphenyls.
Polychlorinated biphenyls if found in Inland and migratory fish should not be over 2.0 ppm and if found in marine fish, crustaceans and mollusks should not be 0.5 ppm.
The results of the present study are consistent with the hypothesis that the good prognosis among overweight and obese people is due to the fact that adipose tissue can store harmful lipophilic chemicals (POPs; e.g., pesticides, polychlorinated biphenyls), thereby sequestering these chemicals from critical organs.
Prezant called the finding surprising due to the short latency period but "biologically plausible" because WTC exposure included polycyclic aromatic hydrocarbons, polychlorinated biphenyls and dioxins-all known carcinogens.
The production of polychlorinated biphenyls (PCBs) was banned worldwide by 1977, but the chemicals linger in the environment at hazardous waste sites, in contaminated fish and food supplies, and in old appliances.
One possibility is that persistent organochlorine pollutants such as polychlorinated biphenyls (PCBs) elicit immunotoxic effects that influence the production of specific antibodies.
"The studies of pesticides and other contaminants that are very common, such as mercury, lead and polychlorinated biphenyls (PCBs), show that all are decreasing IQ levels," says Guillette.
They show that ministers this week (Tues) ordered that aldrin, chlordane, dieldrin, endrin, heptachlor, hexachlorobenzene, mirex, toxaphene, polychlorinated biphenyls (PCB), DDT, chlordecone, the sum of alpha, beta- and gamma-HCH, and hexabromobiphenyl be present in wastes at concentrations not exceeding 50 mg/kg.
A new reference material (RM), RM 8504, has been prepared for use as a diluent oil with Aroclors in transformer oil Standard Reference Materials (SRMs) 3075 to 3080 and SRM 3090 when developing and validating methods for the determination of polychlorinated biphenyls (PCBs) as Aroclors in transformer oil or similar matrices.