中文摘要：

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1．66-5930ng·g-1，均值为763ng·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-GBs和deca-CB含量最低，含量百分比范围分别为0-8．57％和0-11．O％．聚类分析表明，22个样品的污染与Arl248有关，9个样品的污染与Arl254有关；6个样品的污染与Arl016、Arl232和Arl242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．

英文摘要：

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 Z PCBs concentrations detected in the river sediments were in the range of 1.66 to 5 930 ng.g-l, 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 Arl016, 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.