polychlorinated biphenyl

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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 researchers measured concentrations of PCBs in each mother's blood and milk around the time she gave birth and in the children's blood at either 18 months or 7 years of age.
Prior to gas chromatography, these samples were processed using analytical methods used for the determination of PCBs in transformer oil.
When transformers enter the plant, the equipment is stripped, the metals sorted, sheared, cleaned and tested for PCBs.
3] decreased with increasing levels of three PCB congeners, the pesticide p,p'-DDE (a persistent metabolite of DDT), the fungicide hexachlorobenzene, and inorganic mercury.
OrCAD PCB Designer and OrCAD PCB Designer with PSpice feature OrCAD PCB Editor, a new constraint-driven PCB layout-editing tool derived from the Cadence Allegro PCB editor.
Others had suggested that ESBT beneficiaries who were not beneficiaries of a trust's S stock portion should not be included as PCBs, but the IRS denied the request due to a lack of legislative authority.
PCBs and other toxins accumulate across generations in mammals, including the Inuit and many of their food sources.
In SFW113, "EPA Fines University of Hawaii $116,100 for PCB Violations," moved September 29, we are advised by the company that the fifth graph, second line, should read "no PCB transformers" rather than "all the PCB transformers" as originally issued.
The United States banned PCBs, or polychlorinated biphenyls, for a variety of industrial uses after they were found in the 1970s to cause cancer.
There are three major compliance options: One method entails replacing the existing transformer with one that does not contain PCB.
However, several factors present a strong case for the elimination of PCBS in noncommercial units.
existing business growth, number and average value of PCBs and panels produced, panel size, and U.