镉和十二烷基硫酸钠对克氏原螯虾的单一和联合毒性

采用静水生物测试法,研究了十二烷基硫酸钠(SDS)和Cd2+对克氏原螯虾的单一和联合毒性效应。结果表明,SDS对克氏原螯虾24、48、72和96h的半致死浓度(LC50)分别为1365.60、1171.72、1128.43和1120.43mg·L-1,安全浓度(SC)为258.79mg·L-1;Cd2+对克氏原螯虾24、48、72和96h的LC50分别为1197.09、142.06、90.85和82.64mg·L-1,SC值为0.6mg·L-1。SDS和Cd2+对克氏原螯虾的毒性分别为低毒和高毒,毒性大小为Cd2+>SDS。联合毒性试验表明,二者毒性比为1∶1,暴露时间为24、48、72和96h时,相加指数(AI)分别为0.335、0.017、0.030和0.032,联合作用结果均为毒性增强的协同作用。

Single and joint toxicities of Cd2+ and SDS to Procambarus clarkii

By using static test method, this paper studied the single and joint toxicities of SDS and Cd2+ on adult Procambarus clarkii. For SDS, its 24, 48, 72, and 96 h 50% lethal concentration (LC50) and its safety concentration (SC) were 1365.60, 1171.72, 1128.43, 1120.43, and 258.79 mg·L-1, respectively. For Cd2+, the corresponding values were 1197.09, 142.06, 90.85, 82.64, and 0.6 mg·L-1, respectively. SDS had a lower toxicity while Cd2+ had a higher toxicity to P. clarkia. When the toxicity ratio of SDS and Cd2+ was 1:1 and the exposure time was 24, 48, 72, and 96 h, the additive index (AI) was 0.335, 0.017, 0.030, and 0.032, respectively, indicating that the joint toxicity of SDS and Cd2+ was synergistic.