三唑磷·敌百虫和吡虫啉对泽蛙蝌蚪的毒性研究

目的]研究3种农药对泽蛙蝌蚪的急性毒性和联合急性毒性效应。方法]采用联合指数相加法研究三唑磷、敌百虫和吡虫啉对泽蛙蝌蚪的急性毒性及联合急性毒性效应。结果]结果表明，三唑磷、敌百虫和吡虫啉对泽蛙蝌蚪的毒性顺序为三唑磷〉敌百虫〉吡虫啉。三唑磷、敌百虫和吡虫啉对泽蛙蝌蚪的24、48、72和96h的半致死浓度（LC50）分别为8.92、5.83、4.12和2.98mg／L，7.48、5.98、4.67和3.69mg／L，365.90、307.70、257.10和217.90mg／L。联合急性毒性试验表明，3种农药进行两两共存对泽蛙蝌蚪的24、48h的联合毒性均表现为协同作用。结论]该研究结果为合理评价这3种农药混配的安全性和合理使用提供依据。

Study on Toxicity of Triazophos, Trichlorphon and Imidacloprid on Rana limnocharis Tadpole

Objective] The aim of this research was to study toxicity of triazophos,trichlorphon and imidacloprid on R.limnocharis tadpole.Method] The united index add method was used to study the toxicities and the influence of triazophos,trichlorphon and imidacloprid on R.limnocharis tadpole.Result]The results indicated that the acute toxicities of triazophos,trichlorphon and imidacloprid were in the sequence of triazophos > trichlorphon > imidacloprid.The 24,48,72 and 96 h LC50 of triazophos on the tadpoles were 8.92,5.83,4.12 and 2.98 mg/L,respectively;LC50 of trichlorphon were 7.48,5.89,4.67 and 3.69 mg/L,respectively;and LC50 of imidacloprid were 365.90,307.70,257.10 and 217.90 mg/L,respectively.The toxicity of triazophos-ttrichlorphon was shown to be synergism for 24 and 48 h,as well as the toxicity of triazophos-imidacloprid and trichlorphon-imidacloprid.Conclusion]This research will provide the theoretical references for evaluating safety of three kinds of mixed pesticide and its rational use.