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首页> 外文期刊>Environmental Science & Technology >Atmospheric Deposition of PCBs to Moss (Hylocomium splendens) in Norway between 1977 and 1990
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Atmospheric Deposition of PCBs to Moss (Hylocomium splendens) in Norway between 1977 and 1990

机译：1977年至1990年之间，挪威在莫斯（Hylocomium splendens）中进行多氯联苯的大气沉积

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摘要

Samples of Hylocomium splendens collected in 1977, 1985, and 1990 from the same sites in remote areas of Norway have been analyzed for a range of poly-chlorinated biphenyl (PCB) congeners. The ∑PCB concentration (sum of the concentration of the 37 congeners screened) declined in all samples from all locations. It is probable that this decline reflects the reduction in the global use and manufacture of these compounds. Because the samples had been air-dried priorto storage, the possibility of contamination due to contact with laboratory air was investigated. It was concluded that, while some contamination may have occurred, it was largely by the tri- and tet-rachlorinated groups. General trends in the moss ∑PCB composition are therefore believed to reflect broad ambient changes in the PCB concentration over time. While ∑PCB concentrations have declined, temporal changes in the congener pattern in the samples collected from the same locations were noted. For example, in the south of Norway the relative concentrations of hexa- and heptachlorinated homo-logue groups decreased to a greater extent than they did in the north. This observation can be interpreted as evidence for differences in congener recycling through the environment according to their volatility, and it is tentatively suggested that this may provide evidence in support of the global fractionation hypothesis.
机译：已对1977年，1985年和1990年在挪威偏远地区相同地点收集的Hylocomium splendens样品进行了分析，以分析多种多氯联苯（PCB）同源物。来自所有位置的所有样品的∑PCB浓度（筛选出的37个同类物的浓度之和）均下降。这种下降很可能反映了这些化合物在全球范围内的使用和制造的减少。由于样品在存储之前已风干，因此研究了由于与实验室空气接触而造成污染的可能性。结论是，虽然可能发生了一些污染，但这主要是由三氯和四氯三氯代人造成的。因此，moss ∑PCB成分的总体趋势被认为反映了PCB浓度随时间的广泛环境变化。当∑PCB浓度下降时，注意到从相同位置收集的样品中同类物模式的时间变化。例如，在挪威南部，六氯和七氯同系物基团的相对浓度下降的幅度大于北部。根据其挥发性，该观察结果可解释为同类物质在环境中循环利用差异的证据，并初步建议这可为支持整体分级分离假说提供证据。

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  • 来源
    《Environmental Science & Technology》 |1996年第2期|p.524-530|共7页
  • 作者

    WENDY A. LEAD; EILIV STEINNES; KEVIN C. JONES;

  • 作者单位

    Institute of Environmental & Biological Sciences, Lancaster University, Lancaster, LA1 4YQ U.K.;

  • 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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