我国西部地区树皮中类二英多氯联苯的水平及来源
Levels and sources of dioxin-like polychlorinated biphenyls in the tree bark from the western areas of China
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摘要: 本研究通过分析采集自我国西部地区树皮样品中类二英多氯联苯（DL-PCBs）的含量及分布，研究了该区域环境中DL-PCBs的污染水平及来源，同时通过数学模型评估了该区域大气中DL-PCBs的水平.结果表明，我国西部地区树皮中DL-PCBs的浓度范围为nd—1.81 ng·g-1.PCB-118是含量最高的DL-PCBs同族体，约占总浓度的70%.主成分分析结果显示西部地区树皮中DL-PCBs主要来自于大气的远距离传输.同时，本研究利用POPs的树皮-大气分配模型对我国西部地区大气中的DL-PCBs进行了估算，大气中的DL-PCBs的水平范围为0—0.79 pg·m-3.与国内外的研究相比较，我国西部地区大气中DL-PCBs的浓度处于较低水平.Abstract: The pollution level and sources of dioxin-like polychlorinated biphenyls (DL-PCBs) in local environment were investigated by analyzing the contents and distributions of DL-PCBs in the tree bark collected in western areas of china, and the levels of DL-PCBs in the local atmosphere were evaluated by mathematical model. The results indicated that the concentrations of DL-PCBs in bark were from no detected to 1.81 ng·g-1. The predominant PCB congener was PCB-118, contributing to 70% of the total DL-PCB concentrations. The results of principal component analysis showed that DL-PCBs were mainly supplied by long-range atmospheric transport. DL-PCBs concentrations in atmosphere were aslo calculated by using bark-atmosphere distribution model of POPs. The results indicated that the concentrations of DL-PCBs in the atmosphere were from 0 to 0.79 pg·m-3. Compared with the domestic and foreign research results, the levels of DL-PCBs in the atmosphere of western China are at a low level.
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