中文摘要：

因为具有不易降解、易生物蓄积、会对生物及人体产生毒害效应等特征,近年来,多氯联苯（PCBs）在生物体内的富集及其生态风险已引起人们的广泛关注.本文利用GC/MS检测钱塘江流域（杭州段）沉积物、底栖生物及鱼体中PCBs的浓度含量（干重）及分布特征,进一步运用生物富集系数评价了钱塘江流域（杭州段）PCBs的富集状况.结果表明,沉积物中PCBs含量为6.93~10.14ng/g,平均含量为8.85ng/g;底栖生物（螺丝）中PCBs含量为14.83~20.43ng/g,平均含量为15.95ng/g;鲫鱼体内中PCBs含量为19.66~25.93ng/g,平均含量为21.62ng/g;鲢鱼体内PCBs含量为19.25~21.34ng/g,平均含量为20.27ng/g.富集系数进一步表明,钱塘江流域（杭州段）生物对PCBs有较强的生物富集性,有一定潜在的环境风险.

英文摘要：

Because of the nondegradation,trend in bioaccumulation and adverse effects on humans and other animals,polychlorinated biphenyls（PCBs）have received wide attention on the bioaccumulation potentials and ecological risks in recent years.The spatial characteristics and concentration content of PCBs（dry weight）in sediments and organisms are identified and quantified by GC-MS/MS in Qiantang River basin（Hangzhou section）.The accumulation of PCBs in the area is also analyzed and evaluated using the bioaccumulation factors（BAFs）method.The results show that the contents of PCBs vary from 6.93~10.14ng/g,14.83~20.43ng/g,19.66~25.93ng/g and 19.25~21.34ng/g in sediment,screw,crucian and chub,respectively,with an average of 8.85ng/g,15.95ng/g,21.62ng/g and 20.27ng/g,respectively.The value of BAF shows that PCBs has high bioaccumulation in Qiantang River basin（Hangzhou section）which has the potential environmental risk.