范文宏;段勇;林爽;赵春梅;

• 1:北京航空航天大学化学与环境学院环境科学与工程系

摘要(Abstract)：

选择大型溞(Daphnia magna)作为受试生物,以大型溞体内金属积累量、金属硫蛋白含量和死亡率作为测试指标,考察了上覆水体系与水柱-沉积物共存体系中金属镉(Cd)的毒性状况,探讨了水体沉积物中重金属的生物毒性作用机制.结果表明:暴露于水柱-沉积物共存体系和上覆水体系中的大型溞体内的生物积累量均随沉积物Cd含量的升高而升高,且前者显著高于后者,说明沉积物中的Cd可通过食物吸收等途径对生物体致毒、致害;暴露于两种体系中的大型溞体内的MT含量在低浓度条件下随沉积物中Cd含量的升高而升高,当Cd含量高于800μg·g-1时MT含量大幅度下降,并且两体系之间无显著差别;暴露于两种体系中的大型溞幼溞死亡率无显著差别.上覆水中溶解态Cd和沉积物中可交换态Cd是对水生生物重要的毒性影响形态.

关键词(KeyWords)： 沉积物;大型溞;镉;生物毒性;金属硫蛋白;机体负荷

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(No.50678015);; 北京市自然科学基金项目(No.8092019)

作者(Author): 范文宏;段勇;林爽;赵春梅;

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