京杭大运河（徐州）表层沉积物中多氯联苯分布特征研究

为确保南水北调东线工程的调水水质，掌握京杭大运河（徐州）中多氯联苯的污染特征，本研究利用气相色谱—电子俘获检测(GC-ECD)法对京杭大运河（徐州）的七个断面取得的表层沉积物中的12种PCBs同系物进行定量分析测定。研究显示，沉积物中的PCBs的浓度范围在16.55 ng/g～114.31ng/g，均值为47.44 ng/g。其中，邳州段的三个断面平均含量最高，并出现了研究区的最高值。在利用潜在生态危害指数法和加拿大环境委员会制定的SQG评价方法对其进行了初步风险评价后，两种评价方法结果都显示，京杭大运河（徐州）表层沉积物中的PCBs已呈现出明显的生态风险。

The Study on Distribution Features of PCBs in the Surface Sediments of the Grand Canal

In order to ensure the water quality of the South-to-North Water Transfer Project and to study the pollution features of Polychlorinated Biphenyls(PCBs), the author adopts the GC-ECD Method to carry a search of a quantitative analysis measurement of 12 kinds of homologues of PCBs out of surface sediments from 7 sections in the Xu Zhou Section of the Grand Canal. It is indicated that the concentration of the PCBs is between 16.55ng/g to 114.31ng/g, and the mean value is 47.44ng/g. Among the data, the average concentration value obtained from the three cross-sections of PiZhou Section is the highest among the whole section. By adopting the SQG evaluation method which is issued by Canadian Environment Committee and the ecological hazard index method, the author carries a preliminary risk evaluation and both the two methods indicate that the PCBs in the surface sediments of the Grand Canal (XuZhou Section) has an obivous inclination of ecological risk.