太湖沉积物中镉的赋存形态及其与河蚬体内富集的关系  

Speciation of Cd and its relationship with the bioaccumulation of Corbicula fluminea in the sediments of Lake Taihu

作　　者：任静华[1] 马宏瑞[1,2] 王晓蓉[2] 耿金菊[2] 顾雪元[2] 

机构地区：[1]陕西科技大学,西安710020 [2]南京大学,南京210093

出　　处：《湖泊科学》2011年第3期321-324,共4页Journal of Lake Sciences

基　　金：欧盟科技合作专项(0911);国家重点基础研究发展计划项目(2008CB418203);国家水体污染控制与治理科技重大专项项目(2008ZX07316-004)联合资助

摘　　要：通过实验室模拟的方法,将河蚬暴露于镉(Cd)污染太湖沉积物中,研究河蚬软体组织中Cd富集量及其水环境中Cd的分布规律.同时采用薄膜扩散梯度技术(DGT)和BCR形态分析法分别测定沉积物中Cd的有效形态和释放规律.以获得三种方法预测沉积物基准方法的适用性.结果表明,随着加标浓度增大,DGT和BCR测得Cd浓度值增高,上覆水中Cd含量增加,河蚬体内Cd富集量增多.暴露14d和28d后,DGT及BCR两种方法获得的有效态浓度值与河蚬软体组织Cd富集均显著相关,为沉积物质量基准预测提供参考依据.A simulated experiment exposing Corbicula fluminea in the Cd contaminated sediment of Lake Taihu was conducted in laboratory to study the bioaccumulation of Cd in Corbicula fluminea and the distribution regularity of Cd in water.The speciation of Cd extracted by DGT and BCR and the releasing regularities were determined in sediments of Lake Taihu to obtain the applicability of predicting sediment quality guidelines.When the contaminated concentration increased,the concentration of Cd extracted by DGT and BCR in overlying water and accumulated in Corbicula fluminea increased.The results showed that the content of Cd in Corbicula fluminea was significantly correlated with the results measured by two methods after 14 days and 28 days exposure.It offered theoretical statistics for the prediction of sediment quality guidelines of Cd.

关 键 词：沉积物 河蚬 CD 薄膜扩散梯度技术 BCR 太湖 

分 类 号：X524[环境科学与工程—环境工程]