【摘要】 为探究水生环境对Hg2+的承载限度。在实验室条件下,不同浓度Hg2+对水丝蚓胁迫48h后的急性毒性及超氧化物歧化酶(SOD)活性的变化。结果表明:在静水实验条件下,Hg2+溶液对水丝蚓处理48h后半致死浓度(LC50)为9.659μL/L;Hg2+对动物SOD活性影响显著(P<0.05)。当Hg2+浓度在8.000～9.241μL/L范围时,SOD活性显著上升,当浓度增加至16.449μL/L时,SOD的活性呈急剧下降趋势。表明在不同浓度的Hg2+胁迫下,水丝蚓出现不同程度的中毒反应,甚至死亡。更多还原

【Abstract】 In order to clarify the aquatic environment to the bearing limit Hg2+.The author of this article adopted an acute toxicity method to measure the semi-lethal concentration(LC50) of Limnodilus claparedianus that were disposed in Hg2+ with different concentrations.The variation of L.claparedianus SOD activity toxic was tested by means of enzyme activity in this paper.The results showed that the semi-lethal concentration(LC50) of 48 hours was 9.659 μL/L.Hg2+had a significant effect on L.hoffmeisteri SOD activity(P<0.05).The SOD activity in the animal specimen increased when they were disposed in low concentration Hg2 +(8.000-9.241 μL/L).But SOD activity in the animal specimen decreased at different levels when concentrations of Hg2+ increased to 10.674 μL/L,a conclusion was achieved that Hg2+ could cause coercion to L.claparedianus and even cause death of animal individuals,and they could also lead to direct and indirect influence on aquatic ecosystems and the subspecies which were fed by L.claparedianus.更多还原