连云港潮滩表层沉积物中有机氯农药残留特征与风险评估  

Determination of organochlorine pesticide residues in the surface sediments of Lianyungang tidal flat and their ecological risk assessment

作　　者：刘兴健[1] 葛晨东[1] 崔雁玲 邹欣庆[1] 王晓蓉[2] 

机构地区：[1]南京大学海岸与海岛开发教育部重点实验室,江苏省海岸与海岛开发重点实验室,南京210093 [2]南京大学污染控制与资源化研究国家重点实验室,南京210093

出　　处：《环境化学》2012年第7期966-972,共7页Environmental Chemistry

基　　金：国家908项目(JS-908-01-02-05);国家自然科学基金项目(40371048)资助

摘　　要：利用GC-ECD检测了连云港地区绣针河口、临洪河口、灌河口北和灌河口南等4个潮滩断面表层沉积物中DDTs和HCHs含量及组成成分.结果表明,连云港潮滩沉积物中有机氯农药的含量在2.15—24.84 ng.g-1之间,均值为9.09 ng.g-1.其中DDTs的含量在1.11—11.74 ng.g-1之间,均值为3.72 ng.g-1,HCHs的含量在0.38—20.17 ng.g-1之间,均值为5.36 ng.g-1.4个断面有机氯农药含量的顺序是临洪河口>绣针河口>灌河口北>灌河口南.连云港潮滩沉积物中HCHs主要来源于早期林丹在土壤中的残留,灌河口有新的DDT污染源输入.总有机碳是影响绣针河口和临洪河口潮滩有机氯农药分布的主要因素.以风险低值(ERL)为评价基准,沉积物中有机氯农药的最大风险商达到7.43,连云港潮滩有机氯农药存在着一定的潜在生态风险.Twelve surface sediment samples were collected from the Xiuzhen River estuary,the Linhong River estuary,the northern and southern Guan River estuaries on the Lianyungang tidal flat.The concentrations of OCPs in the sediments were analyzed by GC-ECD.The results show that the concentrations of OCPs,DDTs and HCHs vary from 2.15 to 24.84 ng · g-1,from 0.38 to 20.17 ng · g-1 and from 1.11 to 11.74 ng · g-1 respectively.The OCPs concentration is the highest in the Linhong River estuary and the lowest in southern Guan River estuary.The distribution of DDTs components shows that there are some new input sources to the Guan River estuary.HCHs in the sediments may be derived from the non-degraded lindane in the agricultural soils.The OCPs in the Linhong and Xiuzhen River estuary may correlate positively to the TOC content in the sediment.Using the ERL,the highest ERL HQ（hazard quotient） was 7.43 within the samples.Potential ecological risk caused by OCPs would be high on the Lianyungang tidal flat.

关 键 词：有机氯农药 DDTS HCHS 风险评估 沉积物 连云港 

分 类 号：X592[环境科学与工程—环境工程]