苯甲酸钠对草履虫的毒性作用研究

本文研究了苯甲酸钠对草履虫的急性和慢性毒性作用。结果表明：1h急性毒性实验显示，浓度越大，死亡率越高。1h急性毒性作用LC50为14．14g·L^-1，绝对致死剂量为19g·L^-1，最小致死剂量为8g·L^-1。慢性毒性实验显示，种群增长率与苯甲酸钠浓度间具有显著的反应-剂量效应和反应-时间效应，在小于绝对致死剂量情况下，一定时间、一定浓度范围内呈现出浓度越大，种群增长率越高的现象。苯甲酸钠对草履虫生殖的促进作用有可能是环境雌激素的效应。

Research on the Toxicity of Sodium Benzoate against Paramecium

The acute and chronic toxicity of sodium benzoate （SB） against paramecium was studied in this article. The one-hour acute toxicity experiment showed that the higher SB concentration was, the greater was the toxic effect. LC50 was 14.14g·L^-1 while the maximum totally-lethal concentration and minimum lethal con-centration was 19g·L^-1 and 8g·L^-1, respectively. The chronic toxicity experiment indicated that there existed significant dose-response-effect as well as time-response effect between the population growth rate and SB concentration. When the SB concentration was less than the minimum lethal concentration, an increased population growth rate was observed with the higher SB concentration when treated with a certain range of SB con- centration within a certain time. This promotion effect of sodium benzoate on the reproduction of paramecium might be due to the effect of environmental estrogens.