Cd^2＋和Pb^2＋的单一和复合作用对菲律宾蛤仔的急性毒性效应研究

Study on single and joint toxic effects of cadmium and lead on Ruditapes philippinarum

实验生态条件下采用半静态急性毒性实验的方法,比较研究了96 h内不同浓度Cd2+和Pb2+对菲律宾蛤仔(Rudi-tapes philippinarum)的急性毒性效应,分析了不同配比的两种重金属离子的复合作用对目标生物的影响。结果表明:(1)在单一污染物胁迫条件下,Cd2+、Pb2+对菲律宾蛤仔的96 h半数致死浓度LC50分别为4.740 mg/L和31.116 mg/L,其对应的安全质量浓度分别为0.677 mg/L、1.844 mg/L。Cd2+的毒性效应更强。(2)Cd2+和Pb2+的复合毒性效应表明:在所设定的不同浓度配比条件和实验时间下,Cd2+、Pb2+对目标生物均表现出明显的协同作用。

The single and joint toxic effects of different concentrations Cd^2＋ and Pb^2＋ on Ruditapes philippinarum were performed using half-static acute toxicity test under controlled laboratory conditions. The results showed that （ 1 ） the 96 h median lethal concentrations （96 h LCso ） of Cd^2＋ and Pb^2＋ on R. philippinarum were 4. 740 mg/L,31. 116 mg/L, respectively, and the correspondingly safety concentrations（SC） were 0. 677 mg/L and 1. 844 mg/L respectively. Cd2 ~ presented higher toxicity compared to Pb2 ＋ in the present study. （2） The joint toxic effects of Cd^2＋ and Pb^2＋ for different concentration ratio were the synergistic influences according to the changes of 24 h,48 h,96 h LC50.