摘要:
为了探讨密云水库上游流域可能给水库带来的非点源污染,本研究测定了入库河流潮河下游周边土壤中12种类二恶英多氯联苯(DL-PCBs)的含量水平。结果表明,ΣDL-PCBs的总含量水平为0.0039-0.0365 ng·g-1,其中PCB-118,115,77为12种DL-PCBs的主要成分,PCB-81,114,157均低于检出限。草地、林地和果园中ΣDL-PCBs的含量高于玉米地,表明研究区的DL-PCBs主要受大气沉降和河流沉积物的影响,受当地人类活动影响不大。与其他研究相比,采样区域的PCBs含量总体处于偏低水平,毒性当量处于中等水平。而毒性当量因子(TEF)较高的PCB-126与PCB-169,可能会对人类和生物产生危害,应给予足够的重视。
Abstract:
To analyze the possible non-point source pollution influence from upstream area of Miyun Reservior, 12 dioxin-like polychlorinated biphenyl (DL-PCBs) concentrations were determined on soft samples along the lower reach of Chao River. The concentrations of EDL-PCBs ranged from 0.0039 ng·g-1 to 0.0365 ng·g-1 and PCB-118, 115, 77 were the major congeners of the DL-PCBs in this study area. The PCB-81, 114, 157 were all lower than the detection limits. The concentrations of the EDL-PCBs in grass lands, forest lands and orchards were higher than those in corn fields. This implied that DL-PCBs pollution in the study area might be mainly influenced by long-distance atmospheric transportation and deposition and river sedimentations. Lo-cal human activities imposed less impact on DL-PCBs. Compared with other study areas, the mean concentrations of 12 kinds of DL-PCBs in the study area were low. The toxicity equivalency quantity (TEQ) was at a moderate level. PCB-126 and PCB-169, which have higher Toxicity Equivalency Factor (TEF), should be given more attention since they might be harmful to humans and animals.
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