(1) 中国科学院烟台海岸带研究所海岸带环境过程与生态修复重点实验室

The presence of heavy metals in the coastal environment has been of great concern due to their non-biodegradable nature. This study aims to investigate single and joint acute toxic effects of Cd~(2+) and Pb~(2+) on Palaemon carincauda and provides the basis for the water quality management of aquaculture. The effects of different concentrations of Cd~(2+) and Pb~(2+) on P. carincauda within 96 h were investigated by using the semistatic acute toxicity test. The results showed the following:(1)The 24, 48, 72 and 96 h median lethal concentrations(LC_(50))of Cd~(2+) on P. carincauda were 138.699, 33.110, 9.719 and 3.650 mg/L, respectively, and the 48, 72 and 96 h LC_(50) of Pb~(2+) were 254.541, 62.750 and 29.074 mg/L, respectively. The 96 h safety concentrations(SC)of Cd~(2+) and Pb~(2+) on P. carincauda were predicted to be 0.365 mg/L and 2.907 mg/L, respectively;(2)At a concentration ratio of 1︰1, the additive index values for Cd~(2+) and Pb~(2+) were 0.155, 0.068, and 0.258 during the experiment time of 48, 72 and 96 h, respectively. These results indicated that Cd~(2+) presented higher toxicity toward the shrimps than Pb~(2+). Joint toxic effects of Cd~(2+) and Pb~(2+) demonstrated synergistic effects during the experimental period.