水体中重金属镉和锌对大型蚤联合毒性效应的初步研究  

A Preliminary Study on Joint Toxic Effects of Cd and Zn on Daphnia magna

作　　者：张融[1] 范文宏[2] 唐戈[2] 段勇[2] 赵春梅[2] 

机构地区：[1]北京工业大学环境与能源学院,北京100022 [2]北京航空航天大学环境科学与工程系,北京100083

出　　处：《生态毒理学报》2008年第3期286-290,共5页Asian Journal of Ecotoxicology

基　　金：国家自然科学基金项目(No. 50678015)

摘　　要：为了初步探讨重金属镉(Cd)和锌(Zn)对水生生物的联合毒性效应,以大型蚤(Daphnia magna)为研究对象,以蚤体内的金属硫蛋白(MT)含量为毒性指标,研究了重金属Cd和Zn对大型蚤的联合毒性作用.结果表明:Cd和Zn单独暴露下,大型蚤体内MT含量随水体中重金属浓度升高而升高,呈幂函数关系;Cd和Zn联合暴露下,蚤体内MT含量随联合浓度的升高呈先上升后下降趋势;在较低浓度时Cd、Zn表现为协同作用,在中等浓度时表现为相加作用,在较高浓度时表现为拮抗作用;MT可作为Cd、Zn联合毒性评价的敏感指标.In order to study the mechanism of joint toxic effects of heavy metals on aquatic organisms, Daphnia magna was chosen as a testing organism and the metallothionein （MT） was used as a biomarker to study the joint toxic effects of Cd and Zn. The results demonstrated that for the individual Cd or Zn exposure, with the increase of heavy metal concentrations, the contents of MT showed an upward trend （power function）. However, for the Cd and Zn co-exposure, with the increase of co-exposure concentrations, the contents of MT increased first and then decreased. Cd and Zn showed synergistic effects on the MT contents at low co-exposure concentrations, additive effects at middle concentrations and antagonistic effects at high concentrations. MT is a sensitive index to estimate the joint toxic effects of Cd and Zn on aquatic organisms.

关 键 词：重金属 Cd ZN 联合毒性 大型蚤 金属硫蛋白 

分 类 号：X131.2[环境科学与工程—环境科学]