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中文摘要：
采用单因子静态急性毒性试验方法与加和等毒性溶液法，分别研究了Cu^2＋、Zu^2＋、Cd^2＋（Megalobrarna pellegrini）幼鱼的急性毒性和联合毒性效应。结果显示：3种重金属离子对厚颌鲂幼鱼的毒性由强到弱依次为Cu^2＋、Zu^2＋、Cd^2＋其中Cu^2＋对厚颌鲂幼鱼24h、48h、72h、96h的半致死质量浓度（LC50）分别为0．54mg／L、0．38mg／L、0．27mg／L、0．23mg／L；Cd^2＋对厚颌鲂幼鱼24h、48h、72h、96h的半致死质量浓度（LC50）分别为14．32mg／L、8．34mg／L、6．36mg／L、4．44mg／L；Zn^2＋对厚颌鲂幼鱼24h、48h、72h、96h的半致死质量浓度（LC50）分别为21．95mg／L、17．56mg／L、15．33mg／L、14．62mg／L。Cu^2＋、Cd^2＋、Zn^2＋对厚颌鲂幼鱼的安全质量浓度分别为0．056mg／L、0．849mg／L、3．372mg／L。Cu^2＋、Cd^2＋、Zn^2＋两两共存时对厚颌鲂幼鱼96h的联合毒性效应均表现为毒性增强的协同作用。
英文摘要：
Studied the acute toxicity and joint toxicity of Cu^2＋、Zu^2＋ and Cd^2＋ to juvenile of Megalobrama pellegrini by still water test method and equality toxicity meathod. The results indicated that the acute toxicities of three metal ion were in the sequence of Cu^2＋ 〉Cd^2＋ 〉Zn^2＋ , and the median lethal concentrations （LC50） of Cu^2＋ for24 h, 48 h, 72 h and 96 h to juvenile of Megalobrama pellegrini were 0. 54 mg/L, 0. 38 rag/L, 0. 27 mg/L and 0. 23 mg/L respectively; LC50 of Cd^2＋ for 24 h, 48 h, 72 h and 96 h to juvenile of Megalobrama pellegrini were 14. 32 mg/L,8. 34 mg/L,6. 36 mg/L, 4. 44 mg/L respectively and LCso of Zn^2＋ for 24 h, 48 h, 72 h and 96 h to juvenile of Megalobrama pellegrini were 21.95 mg/L, 17.56 mg/L, 15. 33 mg/L and 14. 66 mg/L respectively. The safe concentrations （SC） of Cu^2＋、Zu^2＋ and Cd^2＋ to juvenile of Megalobrama pellegrin were 0. 056 rag/L, 0. 849 mg/L and 3. 372 mg/L respectively. The 96 h joint toxicity results indicated that of any two ion ofCu^2＋、Zu^2＋ Cd^2＋ unit effect to juvenile of Megalobrama pellegrini were cooperate action.
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