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首页> 外文期刊>Environmental Science & Technology >Characterization of the Polychlorinated Biphenyls in the Sediments of Woods Pond: Evidence for Microbial Dechlorination of Aroclor 1260 in Situ
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Characterization of the Polychlorinated Biphenyls in the Sediments of Woods Pond: Evidence for Microbial Dechlorination of Aroclor 1260 in Situ

机译：森林池塘沉积物中多氯联苯的表征：Aroclor 1260原位微生物脱氯的证据

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摘要

PCB-contaminated sediments from the Housatonic River have accumulated in Woods Pond, a shallow impoundment on the river located in Lenox, MA. We used GC/ECD analysis to determine the PCB congener distributions in 181 sediment samples from 94 locations in Woods Pond in order to learn which Aroclors were originally present and whetherthere was evidence of dechlorination. The congener distributions of all samples showed the hexa-, hepta-, and octachloro-biphenyls (octa-CB) characteristic of Aroclor 1260, but key hexa- and hepta-CBs were decreased by as much as 45% relative to Aroclor 1260, and the tri-, tetra-, and penta-CBs were increased. GC/MS analysis revealed unusual tetra-, penta-, and hexa-CBs, many containing 2,4- and 2,4,6-chlorophenyl rings, which are uncommon in higher Aroclors, and provided strong evidence of dechlorination. A quantitative mother-daughter analysis of key hexa- and hepta-CBs that were decreased relative to Aroclor 1260 and their putative dechlorination products yielded mass balances ranging from 90 to 108%. The data indicate that the PCBs consist of partially dechlorinated Aroclors 1260 and 1254 (～95:5). Relative to Aroclor 1260, the most extensively dechlorinated samples had lost 11-19% of the meta chlorines and 2-7% of the para chlorines. This modest dechlorination caused a 20-28% decrease in the concentrations of the PCB congeners reported to be most persistent in humans.
机译：来自胡萨托尼克河的多氯联苯污染的沉积物已堆积在伍兹池塘（Woods Pond）中，该池塘位于马萨诸塞州莱诺克斯市的一条浅水河道上。我们使用GC / ECD分析来确定Woods Pond中94个位置的181个沉积物样品中PCB的同类物分布，以了解最初存在哪些Aroclors以及是否存在脱氯的证据。所有样品的同类物分布均显示了Aroclor 1260的六，七氯联苯和八氯联苯（octa-CB）特征，但相对于Aroclor 1260，关键的六联和七联CB减少了多达45％，并且三，四和五CB均增加。 GC / MS分析揭示了不寻常的四，五和六CB，其中许多含有2,4-和2,4,6-氯苯环，这在高级Aroclor中并不常见，并提供了强有力的脱氯证据。相对于Aroclor 1260减少的关键六-和七-CB及其假定的脱氯产物的定量母女分析得出的质量平衡为90％至108％。数据表明，多氯联苯由部分脱氯的Aroclors 1260和1254（〜95：5）组成。相对于Aroclor 1260，最广泛脱氯的样品损失了11-19％的间氯和2-7％的对氯。这种适度的脱氯作用导致人类报告中最持久的多氯联苯同源物浓度降低了20-28％。

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  • 来源
    《Environmental Science & Technology》 |1996年第1期|p.237-245|共9页
  • 作者

    DONNA L. BEDARD; RALPH J. MAY;

  • 作者单位

    Environmental Laboratory, GE Corporate Research and Development, Schenectady, New York 12301;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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