Cd2+和Hg2+对波纹龙虾的急性毒性

采用毒理学方法,在水温28.0~29.0℃下于0.5 m^3的圆形玻璃钢桶中,用氯化镉和氯化汞配成不同质量浓度的Cd^2+和Hg^2+试验溶液,研究Cd^2+和Hg^2+对体质量49.10~52.10 g波纹龙虾的毒性,用直线内插法求得Cd^2+和Hg^2+的半致死质量浓度及安全质量浓度。试验结果显示,Cd^2+对波纹龙虾的24、48、72、96 h半致死质量浓度分别是2.5169、1.3378、1.0445、0.9500 mg/L,安全质量浓度为0.0095 mg/L;Hg^2+对波纹龙虾的24、48、72、96 h半致死质量浓度分别是0.0560、0.0333、0.0246、0.0227 mg/L,安全质量浓度为0.000227 mg/L。Hg^2+对波纹龙虾的毒性作用强于Cd^2+的毒性作用。

Acute Toxicity of Cd^2+and Hg^2+to Salloped Spiny Lobster Panulirus homarus

Acute toxicity of heavy metals Cd^2+and Hg^2+prepared from cadmium chloride and mercury chloride to scalloped spiny lobster Panulirus homarus with body weight of 49.10—52.10 g was tested in a 0.5 m^3 round glass steel bucket at water temperature of 28.0—29.0°C by a toxicological method.The median lethal concentration(LC50)and safety concentrations(SC)of Cd^2+and Hg^2+were obtained by linear interpolation based on the relationship between mortality rates of shrimp and heavy metal doses.The LC50 value of Cd^2+in scalloped spiny lobster was found to be 2.5169 mg/L at 24 h,1.3378 mg/L at 48 h,1.0445 mg/L at 72 h and 0.9500 mg/L at 96 h,with the corresponding SC level of 0.0095 mg/L.The LC50 of Hg^2+in spiny lobster were 0.0560 mg/L at 24 h,0.0333 mg/L at 48 h,0.0246 mg/L at 72 and 0.0227 mg/L at 96 h,with SC of 0.000227 mg/L,indicating that metal Hg^2+was more toxic to scalloped spiny lobster than that of metal Cd^2+.