太湖沉积物中有机氯农药的残留特征及风险评估

Organochlorine Residues of Sediments in Taihu Lake and Its Risk Evaluation

分析了太湖沉积物中的有机氯农药残留情况 ,发现DDT及其代谢产物、HCH的异构体、艾氏剂、狄氏剂、六氯苯、七氯等在几乎所有的样品中均被检出 .其中 β HCH、p ,p’ DDE和六氯苯的残留水平最高 ,平均值分别达到6 5 72ng/ g、1 4 3 2ng/ g和 2 1 5 8ng/ g(干重 ) ,沉积物的HCHs含量明显高于DDTs .有机氯农药的主要来源为地表径流入湖、大气沉降和工业污水排放 .数据表明太湖沉积物的HCHs、DDTs比报道的中国江河沉积物高 ,但低于海湾沉积物 .根据海洋风险评估值进行对比 。

This study analyzed chlorinated pesticides of sediments in Taihu Lake. The DDT, DDE, DDD, HCH isomers, Aldrin, Diddrin, Hexachlorobenze, Heptachlor were measured in all samples.β-HCH、p,p'-DDE and Hexachlorobenze had higher concentrations than others. The average values of them were 6.572ng/g,1.432ng/g and 2.158ng/g ,respectively. HCHs in sediments were higher than DDTs.The organochlorine residues in sediments mainly originated form the runoff, atmospherically deposition and industrial sewage. HCHs and DDTs of sediments in Taihu Lake were higher than those of sediments in Chinese rivers, but lower than those of bays reported in some papers. According to the ERL and ERM value of risk evaluation for ocean which can also be applied for lake, sediments in Taihu Lake pose a low risk to consumers of bottom feeders.