电子废物拆解区河流沉积物中多氯联苯的污染水平、分布及来源

用GC-μECD分析法测定了浙江台州路桥河流表层沉积物中144种多氯联苯同类物的含量.目的是了解该地区河流沉积物中PCBs的污染水平、空间分布特征和可能来源.结果表明,在路桥区河流沉积物样品中PCBs同类物均有不同程度检出,ΣPCBs的浓度范围1.66～5 930 ng.g-1,均值为763 ng.g-1.样品组成以tri-CBs、tetra-CBs和penta-CBs为主,含量百分比范围分别为2.63%～57.6%、10.4%～54.6%和7.82%～46.1%;octa-CBs和deca-CB含量最低,含量百分比范围分别为0～8.57%和0～11.0%.聚类分析表明,22个样品的污染与Ar1248有关,9个样品的污染与Ar1254有关;6个样品的污染与Ar1016、Ar1232和Ar1242有关.与国内外其它研究及相关环境质量标准相比,该区域表层沉积物PCBs污染处于中高水平,具有较高的生态风险.

Levels, Distribution and Possible Sources of Polychlorinated Biphenyls in River Sediments from an Electronic Waste Recycling Area

The concentrations of 144 polychlorinated biphenyls(PCBs) in the river sediments from Luqiao were analyzed by GC-μECD.The objectives of this study were to understand the contents,spatial distribution and possible sources of PCBs.The PCBs concentrations detected in the river sediments were in the range of 1.66 to 5930 ng·g-1,with a mean of 763 ng·g-1.Tri-CBs,tetra-CBs and penta-CBs were the primary PCB congeners in all samples,accounting for 2.63%-57.6%,10.4%-54.6% and 7.82%-46.1%,respectively.Octa-CBs and deca-CBs were the minor PCB congeners in all samples,with the percentages of 0-8.57% and 0-11.0%,respectively.The hierarchical cluster analysis(HCA) showed that 22 samples were mainly polluted by Ar1248,9 samples were polluted by Ar1254,and 6 samples were contaminated by Ar1016,Ar1232 and Ar1242.The PCBs concentrations found in the present study were at an upper-middle level compared with those in other studies in the world.The PCBs pollution in the present area had a high ecological risk.