【摘要】 近年来,水体中重金属污染呈现多样化、复杂化,但有关多种金属的联合毒性机制的探讨尚少.选择大型蚤(Daphnia magna)作为受试生物,以蚤体内的超氧化物歧化酶(SOD)活性为毒性指标,初步探讨重金属镉(Cd)和锌(Zn)对水生生物的联合毒性效应.结果表明:无论是在Cd和Zn单独暴露还是联合暴露的情况下,大型蚤体内SOD活性都随时间变化明显,表现为先升高后下降的趋势;Cd和Zn联合暴露下,联合作用表现为拮抗作用;SOD可作为Cd、Zn联合毒性评价的敏感指标.更多还原

【Abstract】 Recently,the contamination of heavy metals is various and complicated in water.In order to study the mechanism of the joint toxic effects of heavy metals,Daphnia magna was chosed as a testing organism,and the superoxide dismutase(SOD) was used as a biomarker to study the joint toxic effects of Cd and Zn.The results demonstrates that the SOD activity varies with the increase of exposure time,first increase and then decrease for the co-exposure as well as individual exposure of Cd and Zn.Cd and Zn show antagonistic effects on the SOD activity for co-exposure situations.So SOD is a sensitive parameter to estimate the joint toxicity of Cd and Zn on aquatic organisms.更多还原