关键词: 弛豫时间, 弛豫时间

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.