基于主成分分析的上海市大气降水中DL-PCBs来源初判

运用主成分分析法(PCA)初步判断2010年11月—2011年10月覆盖上海市18个行政区20个采样点大气降水中类二噁英多氯联苯(DL-PCBs)的来源。结果表明,研究期间上海市大气降水中DL-PCBs成分以五氯代PCBs为主。PC1判断可能为含DL-PCBs成分的日本PCBs产品KC500,PC2判断可能为含DL-PCBs成分的日本KC600及美国Aroclor1260产品,PC3可能为国产PCBs产品。由此判断,上海市大气降水中DL-PCBs受多种来源共同影响。前两大主要来源可能为来自环境中美国Aroclor1260和日本KC500、KC600产品的历史使用残留,第三大来源才可能是我国国产PCBs产品在大气环境中的残留。

Preliminary Source Identification of DL PCBs in Precipitation of Shanghai by PCA

The principal component analysis (PCA) method was used to identify preliminarily the sources of DL PCBs in precipitation collected from 20 sampling sites over 18 districts of Shanghai between November 2010 and October 2011. The results showed that the main components of DL PCBs in precipitation of Shanghai were mainly penta PCBs. PC1 was identified as Japanese PCBs product KC500 containing DL PCBs component. PC2 was identified as Japanese PCBs product KC600 and U.S. Aroclor1260 containing DL PCBs component. PC3 might be domestic PCBs products. It was concluded that DL PCBs in atmospheric precipitation of Shanghai originated from variety of sources. The first two major sources were more likely from the residues of early used U.S. Aroclor1260, Japanese KC500 and KC600 products in the environment. The third major sources might be the residue of domestic PCBs products in the atmosphere.