中文摘要：

采集了珠江三角洲典型区域384个表层农田土壤样品，分析了其中常见6种土壤多氯联苯（PCB28、PCB52、PCB101、PCB138、PCB153与PCB180）的残留状况。研究结果表明：6种多氯联苯总量（Z6PCBs）的检出率为78．13％，其半均值为0．42μg／kg。PCB138的检出率与含量高于其他5种PCBs：土壤中6种多氯联苯的残留状况存在很大的差异：PCB101的检出率最低，仅为10．16％，但其平均值（0．11μg／kg）较高，主要源于某点位PCB101高达32．44μg/g，土壤受到了严重污染。线性相关关系分析结果表明：土壤有机质、黏粒含量则与PCB52存在显著正相关关系。总体而言，低氯代的PCBs含量与土壤理化性质具有一定的相关性，高氯代的PCBs呈现典型的点位污染且在点位土壤中其含量显著高于低氯代同系物。

英文摘要：

A total of 384 soil samples were collected from surface agricultural soils of typical regions of Pearl River Delta, China. Six common congeners of PCBs （PCB28, PCB52, PCB101, PCB138, PCB153 and PCB180） were analyzed. The results showed that the detection frequency of Σ6PCBs was 78.13% and the average concentration of Σ6PCBs was 0.42 μg/kg. Both the detection frequency and the average concentration of PCB138 were higher than those of the other PCBs. There were differences among the concentrations of six PCBs in soil. The detection frequency of PCB101 was lowest （10.16%）, but its average concentration was up to 0.11 μg/kg owing to PCB101 of 32.44 μg/kg found in one soil sample, which suggested the heavy soil pollution around the site. There were the significant linear correlations of the concentration of PCB52 with soil organic matter and clay content. It could be also derived that there was the correlation between the concentration of low chlorinated PCBs and soil physicochemical properties. High chlorinated PCBs were easily concentrated in typical sites and their concentration might be much higher than that of low chlorinated PCBs.