氯化镉对草鱼的毒性研究

Ecological Toxicity of Cadmium Chloride on Grass Carp(Ctenopharyngodon idellus)

以静水生物测试法研究氯化镉对草鱼的急性毒性,并求出暴露时间分别为24、48、72和96h的半数致死质量浓度(LC50)。根据鱼类毒性分级标准,判断重金属镉对草鱼的生态毒性,并利用安全系数0.01来估算其安全浓度。结果表明:镉对草鱼的急性毒性作用时间为24、48、72和96h的LC50分别是44.10、33.48、28.00和23.51mg/L,因此镉对草鱼的毒性为高毒,其安全浓度为0.235 mg/L。

The acute ecological toxicity of cadmium chloride acting on grass carp was inves-tigated using the water-static biological test method, and median lethal concentration （LC50）values under 24,48,72 and 96h exposure time were evaluated. According to the ratingsstandard of fish toxicity, heavy metals cadmium to the ecological toxicity of grass carp wasevaluated, and safe coefficient 0. 01 was used to evaluate its safe concentration. The resultsshowed that LCs0 under 24,48,72 and 96h for cadmium chloride toxic to grass carp was44. 61,33.48,28.00 and 23.51 mg/L, respectively. Thus, the ecological toxicity of cadmi-um to grass carp was at high toxicity, and the safe concentration was 0. 235 mg/L.