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polychlorinated biphenyl
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   Also found in: Medical, Encyclopedia, Wikipedia 0.07 sec.

polychlorinated biphenyl

Any of a group of chlorinated isomers of biphenyl (C6H5)2. They are dangerous industrial chemicals, valuable for their fire-resistant qualities. They constitute an environmental hazard because of their persistent toxicity. Since 1973 their use had been limited by international agreement. In December 2000, 122 nations agreed a treaty to ban the toxic chemicals known as persistent organic polluters (POPs), which include PCBs, although they are unlikely to be totally eliminated until about 2025.



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2000), we also estimated the blubber PCB concentrations based on the commercial formulation Aroclor 1254.
This suite of Aroclor transformer oil SRMs consists of individual Aroclors in the same transformer oil that was used to prepare RM 8504 and is intended for use in the determination of PCBs in oil.
The effect of aroclor 1254 (PCB) on the physiology of reproduction in the female rat--I.
 
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