毒死蜱农药对草履虫的毒性研究

研究了有机磷农药毒死蜱对草履虫的急慢性毒性作用。结果表明:毒死蜱溶液的不同浓度对草履虫的生长有极显著影响,浓度越高毒性作用越大,毒死蜱对草履虫的1h急性毒性作用LC50为0.0435 9mg/L,最大无致死浓度为0.002 5mg/L,最小全致死浓度为1.29mg/L。回归分析结果显示,草履虫种群增长率和毒死蜱溶液浓度呈线性相关。慢性毒性试验结果显示,毒死蜱浓度在0.005~1.29mg/L范围内,浓度对数越小(即毒死蜱浓度越小)种群增长率越大,说明毒死蜱溶液在一定低浓度范围内可能具有环境内分泌干扰物效应。

Research on Toxicity of Pesticide Chlorpyrifos to Paramecium

The acute and chronic toxicity of organophosphate pesticide(chlorpyrifos)to Paramecium was studied,revealing concentrations of the chlorpyrifos solution laid remarkable effect on growth of Paramecium and the higher the concentration,the greater the toxicity.The acute toxicicity experiment for 1 hour showed LC50 was 0.04359mg/ L,the maximum non-lethal concentration and minimum totally-lethal concentration was 0.0025mg/L and 1.29mg/L,respectively.Regression analysis manifested the linear relation between population growth rate and concentration of the chlorpyrifos solution.The chronic toxicity experiment revealed that when the concentration of chlorpyrifos solution ranged from 0.005 to 1.29mg/L,the lower the concentration logarithmic value,the greater the population growth rate,which indicated the action of environmental estrogens within a certain range of the concentration.