3种重金属离子对中华鳑鲏鱼的急性毒性及安全浓度研究

目的]找出Hg^2＋、Cu^2＋和Cd^2＋3种重金属离子对中华鳑鲏鱼（Rhodens sinensis Gunther）的急性毒性效应和安全浓度。方法]采用静水生物法研究了Hg^2＋、Cu^2＋和Cd^2＋对中华鳑鲏鱼的急性毒性作用,采用概率单位-对数图解法计算了3种重金属离子对中华鳑鲏鱼24、48、72、96h的半致死质量浓度（LC50）。结果]Hg^2＋和Cu^2＋对中华鳑鲏鱼的毒性较强;Cd^2＋对中华鳑鲏鱼的毒性相对较弱。3种金属离子的毒性大小顺序为：Hg^2＋〉Cu^2＋〉Cd^2＋,它们对中华鳑鲏鱼24h的LC50分别为0.222、0.344和10.360mg/L,48h的LC50分别为0.215、0.279和8.820mg/L,72h的LC50分别为0.204、0.256和7.910mg/L,96h的LC50分别为0.193、0.236和7.270mg/L,安全浓度分别为0.00193、0.00236和0.07270mg/L。结论]中华鳑鲏鱼对Cd^2＋有较强的耐受力,对Cu^2＋比较敏感。

Study on Acute Toxicity and Safe Concentration of 3 Heavy Metal Ions to Rhodens sinensis Gunther

Objective]The research aimed to study the acute toxicity and safe concentration of Hg2+,Cu2+ and Cd2+ to Rhodens sinensis Gunther.Method]The acute toxicity of Hg2+,Cu2+ and Cd2+ to Rhodens sinensis Gunther were determined with the static test method,and the helf lethal concentration(LC50)were of Hg2+,Cu2+and Cd2+ to Rhodens sinensis Gunther at 24,48,72 and 96 h were calculated with probit-logarithmic diagrams method.Result]The results showed that Hg2+and Cu2+had stronger toxicities to Rhodens sinensis Gunther,while Cd2+ had weaker toxicities to Rhodens sinensis Gunther relatively. The toxicities to Rhodens sinensis Gunther was in order:Hg2+>Cu2+> Cd2+,and theie LC50 to Rhodens sinensis Gunther were 0.222,0.344 and 10.3 60 mg/L at 24 h,0.215,0.279 and 8.820 mg/L at 48 h,0.204,0.256 and 7.910 mg/L at 72 h,0.193,0.236 and 7.270 mg/L at 96 h,respectively,and their safe concentration to Rhodens sinensis Gunther were 0.001 93,0.002 36 and 0.072 70 mg/L respectively.Conclusion]Rhodens sinensis Gunther has stronger resistance to Cd2+ and is sensitive to Cu2+.