多氯联苯(PCBs)是变压器中使用的一种耐高温绝缘材料,绝缘液约含70%PCBs和30%三氯化苯。一般认为,变压器是密闭系统,工人不可能接触PCBs,但实际上在变压器的衬垫、轴套和焊接点常有渗漏,工人在检修时需用泵抽取绝缘液。传统的工业卫生对职业接触PCBs的评价主要测定空气浓度作为工人的 Polychlorinated biphenyls (PCBs) are a type of high temperature insulating material used in transformers. Insulating fluids contain about 70% PCBs and 30% trichlorobenzene. Generally believed that the transformer is a closed system, workers may not touch the PCBs, but in fact, the transformer liner, bushings and welding often leaks, workers in the maintenance of the need to pump insulation fluid extraction. The traditional industrial hygiene evaluation of occupational exposure to PCBs primarily determines the air concentration as a worker