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首页> 外文期刊>Environmental Science & Technology >Historical Profiles of Chlorinated Paraffins and Polychlorinated Biphenyls in a Dated Sediment Core from Lake Thun (Switzerland)
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Historical Profiles of Chlorinated Paraffins and Polychlorinated Biphenyls in a Dated Sediment Core from Lake Thun (Switzerland)

机译：来自图恩湖（瑞士）的陈旧沉淀物中氯化石蜡和多氯联苯的历史概况

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A dated sediment core from Lake Thun covering the last 120 years was analyzed to get an overview of the historical trend of the chlorinated paraffin (CP) and polychlorinated biphenyl (PCB) deposition, because CPs and PCBs have/had similar applications as plasticizers and flame retardants. Total CP concentrations (sum of short chain (SCCP), medium chain (MCCP), and long chain CPs (LCCP)) showed a steep increase in the 1980s and a more-or-less stable level of 50 ng g~(-1) dry weight (dw) since then. The concentration-time profile is in good agreement with the available information on global production data. The quantification of higher chlorinated SCCPs using electron capture negative ionization low resolution mass spectrometry (ECNI-LRMS) revealed an increase in recent years. In addition, the degree of chlorination of SCCPs has strongly increased during the past 40 years, which may indicate its use as an additive for plastics, paints, and coatings. Furthermore, PCBs were analyzed in dated sediment slices. The PCB concentrations (sum of the six indicator congeners) peaked around 1969 (18 ng g~(-1) dw) and decreased to 1.3 ng g~(-1) dw in the surface layer corresponding to 2004. The peak level of CPs exceeded those of PCBs by about a factor of 3.
机译：分析了图恩湖过去120年的过期沉积物芯，以概述氯化石蜡（CP）和多氯联苯（PCB）沉积的历史趋势，因为CP和PCB具有与增塑剂和火焰相似的用途阻燃剂。总CP浓度（短链（SCCP），中链（MCCP）和长链CP（LCCP）的总和在1980年代急剧增加，稳定水平为50 ng g〜（-1 ），然后再计算干重（dw）。浓缩时间曲线与全球生产数据的可用信息高度吻合。使用电子捕获负电离低分辨率质谱（ECNI-LRMS）定量分析高级氯化短链氯化石蜡显示出近年来的增长。另外，在过去的40年中，短链氯化石蜡的氯化程度大大提高，这可能表明短链氯化石蜡被用作塑料，油漆和涂料的添加剂。此外，在过时的沉积物中对多氯联苯进行了分析。多氯联苯的浓度（六个指示同类物的总和）在1969年左右达到峰值（18 ng g〜（-1）dw），并在2004年降低到表层的1.3 ng g〜（-1）dw。CPs的峰值水平超过PCB约3倍。

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