单词 | polychlorinated biphenyl |
释义 | polychlorinated biphenylpol·y·chlo·rin·at·ed biphenylP0421600 (pŏl′ē-klôr′ə-nā′tĭd)polychlorinated biphenyl(ˌpɒlɪˈklɔːrɪˌneɪtɪd)polychlorinated biphenylpolychlorinated biphenylorPCB,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]polychlorinated biphenylbiphenyl[bi-fen´il]pol·y·chlo·rin·at·ed bi·phen·yl (PCB),polychlorinated biphenyl(pŏl′ē-klôr′ə-nā′tĭd)pol·y·chlo·rin·at·ed bi·phe·nyl(polē-klōri-nā-tĕd bī-fenil)polychlorinated biphenylPCB. Any one of a family of industrial pollutants known to be capable of inducing cancer. |
随便看 |
|
英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。