模拟城市径流中加乐麝香和镉对大型水蚤的毒性效应

Toxic effects of galaxolide and cadmium on Daphnia magna under polluting flow conditions containing soil-water interfaces from urban areas

通过生物测试,研究了加乐麝香和重金属镉在模拟城市径流和清水条件下对大型水蚤(Daphnia magna)的单一、联合毒性效应.结果表明,在单一毒性效应试验中,当暴露时间为24,48h时,加乐麝香和镉在模拟城市径流条件下的EC50值分别为2.455,1.187mg/L以及0.384,0.304mg/L;在清水试验条件下的EC50值分别为0.533,0.189mg/L以及0.359,0.244mg/L.2种污染物在模拟城市径流条件下EC50值均高于清水条件下的EC50值.采用毒性1∶1试验测定2种污染物联合毒性效应,当暴露时间为24,48h时,在清水条件下AI>0,二者联合毒性效应表现为协同效应;在模拟城市径流条件下,AI<0,联合毒性效应为拮抗效应.

The polluting flow containing soil-water interfaces from urban areas was simulated under laboratory conditions in order to better evaluate the toxicity of contaminants in natural water. Single and joint toxicity of galaxolide and cadmium were evaluated to Daphnia magna in waters containing suspended solids and suspended solids-free water. EC50 of Daphnia magna in waters containing suspended solids exposed to galaxolide at 24h and 48h was 2.455 and 1.187 mg/L, and that exposed to Cd was 0.384 and 0.304 mg/L, respectively. In suspended solids -free water EC50 of Daphnia magna exposed to galaxolide at 24h and 48h was 0.533 and 0.189mg/L, and that exposed to Cd was 0.359 and 0.244 mg/L, respectively. Using the 1：1 toxicity method, while the exposure time was 24h and 48h, the joint toxicity of galaxolide and Cd was antagonistic in waters containing suspended solids, respectively. However, in suspended solids-free water it was synergistic, respectively.