Cu^2＋、Pb^2＋和Zn^2＋对大型潘的单一及联合毒性效应

重金属的复合污染毒性效应研究在生态环境评价中具有重要的实践意义．本研究以大型潘为试验材料，通过静水生物测试法，研究Cu^2＋、Pb^2＋和Zn^2＋三种金属离子对其的单一毒性及联合毒性效应．单一毒性实验结果表明，Cu^2＋、Pb^2＋和Zn^2＋对大型溢的毒性大小顺序为Cu^2＋〉Pb^2＋〉Zn^2＋联合毒性实验结果表明，Cu^2＋-Zn^2＋、Cu^2＋-Ph^2＋和Cu^2＋-Pb^2＋-Zn^2＋三组的联合毒性均表现为协同作用，Ph^2＋-Zn^2＋的联合毒性表现为拮抗作用．联合毒性与毒物的组合有关，与毒物配比和暴露时间没有关系．

INDIVIDUAL TOXICITY AND JOINT TOXICITY OF COPPER LEAD AND ZINC IONC TO DAPHNIA MAGNA

Research on toxic effect of heavy metal combined pollution plays an importance role in ecological environment evaluation. The individual toxicity and the joint toxicity of Cu2＋ , Pb2＋ and Zn2＋ to Daphnia magna were investigated with a static test method. Results showed that the toxicity of Cu2＋ ,Pb2＋ and Zn2＋ was degressive and the joint toxicity of Cu2 ＋ - Zn2 ＋ , CuE ＋ - Pb2 ＋ and Cu2 ＋ - Pb2 ~ - Zn2 ＋ was synergetic action, while Pb2 ＋ - Zn2 ＋ was antagonistic action. Joint toxicity was affected by combined gradation of poisons but it had no relation with ratio of chemical and exposure time.