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Supersonic Cleanup

机译：超音速清理

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When polychlorinated biphenyls (PCBs) were first synthesized in 1881, the relatively fire-resistant and stable compounds were desirable components in a wide range of industrial and consumer products. By the 1930s manufacturers were aware that PCBs caused serious health problems in their workers, and doctors advised them that other effects could be occurring as well. But this did not stop industries from continuing to produce and use PCBs, or from releasing PCBs into the environment. Today PCB-contaminated soils pose an enormous environmental problem. These toxic chemicals, which didn't cease being produced until the 1970s, still exist in several industrial sites, including manufacturing, electric generation and military facilities. They continue to enter the environment through the improper disposal of PCB-containing materials and accidental incidents, such as fires. The health impacts can be brutal, as PCBs bio-accumulate in the body and may cause a range of adverse health effects, including cancer, immune suppression, and reproductive damage. (See Chemical Corner, October/November 2004 edition.)
机译：当多氯联苯（PCB）于1881年首次合成时，相对耐火且稳定的化合物是广泛的工业和消费产品中所需的组分。到1930年代，制造商意识到多氯联苯在其工人中造成了严重的健康问题，医生建议他们也可能发生其他影响。但这并不能阻止行业继续生产和使用PCB，也不会阻止PCB释放到环境中。如今，PCB污染的土壤构成了巨大的环境问题。这些有毒化学物质直到1970年代才停止生产，但仍存在于多个工业场所，包括制造业，发电业和军事设施。它们继续通过不当处理含PCB的材料和意外事件（例如火灾）而进入环境。健康的影响可能是残酷的，因为PCB在体内生物积累，并可能导致一系列不利的健康影响，包括癌症，免疫抑制和生殖损害。 （请参阅《化学角》，2004年10月/ 11月版。）

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