长江口潮滩表层沉积物中PCBs和OCPs的分布

Distribution of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in the tidal beach surface sediments of Yangtze estuary

对长江口潮滩表层沉积物中的多氯联苯（PCBs)和有机氯农药(ocPs)进行Gc—EcD测试，结果表明PcBs含量分布在0．19—18．95ng／g，平均值为2．70ng/g，其分布随采样点的位置变化显著：排污口附近出现最大值，离排污口越远，即受排污影响的程度越小，其含量越低OCPs含量在1．25-36．01ng/g，平均值为8．5ng/g，分布特征与PcBs相似，表明了它们来源的相似性．研究区内PcBs和ocPs的含量低于ER-L值，尚未对生物造成显著的负面影响。

Polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) in the tidal beach surface sediments of Yangtze Estuary were determined with GC-ECD. The results showed that the content distribution of PCBs ranged from 0.19~18.95ng/g, with an average value of 2.70ng/g. Its distribution changed dramatically with the position of sampling site. The maximum value appeared near sewage discharge mouth. The farther the distance from the mouth, the less the degree of influence of the discharge, and the lower of its content. The OCPs content ranged from 1.25 to 36.01ng/g with an average of 8.50ng/g, and its distribution character was similar to that of PCBs, indicating their similar sources. The contents of PCBs and OCPs in the study area are lower than the ER-L values, not yet forming obviously the adverse biological effects.