氧化乐果对静水椎实螺急性毒性和酶活性的影响

Acute Toxicity and Influence on Enzyme Activities in Lymnaea stagnalis Exposed to Omethoate

[目的]探究有机磷农药氧化乐果对水生生物的毒性效应。[方法]测定了氧化乐果对静水椎实螺(Lymnaea stagnalis)的急性毒性,并研究了氧化乐果对静水椎实螺组织中乙酰胆碱酯酶(AChE)和超氧化物歧化酶(SOD)活性的影响。[结果]氧化乐果对静水椎实螺的96 h-LC50为19.22 mg/L,安全浓度为1.92 mg/L。静水椎实螺暴露于氧化乐果中5 d,AChE活性明显下降,SOD活性在0.53、1.06mg/L浓度下上升不明显,在2.65、5.30 mg/L浓度下呈明显下降。[结论]为氧化乐果的使用和及其污染防治提供了理论依据。

[Objective] The aim was to explore toxic effects of omethoate on aquatic specials.[Method] The acute toxicity of omethoate against Lymnaea stagnalis was measured,and the effects of omethoate on acetylcholinesterase（AChE） and superoxide dismutase（SOD） in the tissues of L.stagnalis were studied.[Result] The 96 h median lethal concentration of omethoate against L.stagnalis was 19.22 mg/L,and the safety concentration was 1.92 mg/L.After L.stagnalis was exposed to omethoate for five days,the activity of AChE in the tissues of L.stagnalis decreased obviously,while the activity of SOD increased in the concentrations of 0.53 and 1.06 mg/L slightly and decreased in the concentrations of 2.65 and 5.30 mg/L obviously.[Conclusion] The research result provides theoretical basis for the application and pollution control of omethoate.