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 ?
Export of PCB capacitors for final disposal (including: packing, transport, temporary storage, export and final disposal, as descibed in part 3 - scenario A)
Due to this reality, electronics engineers choose to collaborate on PCB design layouts.
PCBs are only slowly decomposed in the environment.
A estimativa da ingestao diaria de PCBs atraves do consumo de arroz e feijao foi calculada multiplicando-se a concentracao dos residuos pelo consumo do alimento, dividindo este valor pelo peso corporal medio de 60kg, sugerido por STORELLI et al.
Although studies investigating health effects from inhaled PCBs are limited, the collective results of those studies suggest potential to result in adverse health effects.
Furthermore, in order to estimate the industrial sources of PCBs, two wastewater samples were collected from the largest dyeing chemical group in this zone, which mainly produced disperse, reactive, acid, vat dyestuff, or pigments and intermediates.
Lisa Beal, director, environment and construction policy, INGAA, says, "It is impossible for me to say definitively how much PCB remains in the system, but we can say that since the ban no new PCBs have been introduced into the system and when found, they are removed.
During a survey of 120 homes on Cape Cod, Mass., researchers found two houses with unusually high PCB concentrations in air and house dust.
Rigid PCB shipments are down 12.6% and bookings are down 23.7% in March 2007 from March 2006.
Prior to gas chromatography, these samples were processed using analytical methods used for the determination of PCBs in transformer oil.
The unit destroys PCBs with heat, which drives off the volatiles and then runs them through a process, Dekker says.
Among infertile men, levels of PCBs and PEs were highest in urban fish eaters and lowest in rural vegetarians.