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Effects of Cu2+, Zn2+, Al3+ on single and joint toxicities of loach |
LU Shaoyong1, ZHAO Budiao2, LIU Jie1,2, ZHU Xu1, CHEN Fangxin1,3, WU Xin1 |
1. State Environmental Protection Scientific Observation Station of Dongting Lake, State Key Laboratory of Environmental Benchmark and Risk Assessment, National Engineering Laboratory for Lake Water Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. College of Environment and Resource, Dalian Nationalities University, Dalian 116600, China;
3. China Unversity of Geosciences, Institute of Water Resources and the Environment, Beijing 100012, China |
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Abstract: In order to study the acute toxicity of three kinds of ions (Cu2+, Zn2+, Al3+) on loach and the change of the processed loach liver antioxidant enzyme activity and lipid peroxidation, experiments have been conducted. The result shows that for loach exposed to Cu2+, Zn2+, Al3+ solutions, the 24 h half-lethal concentrations are Zn2+ 3.243 and Al3+ 1.497 mg/L; the 48h half-lethal concentrations are Cu2+1.054 mg/L, Zn2+3.017 mg/L and Al3+ 1.425 mg/L; the 72 h half-lethal concentrations are Cu2+ 0.666, Zn2+3.017 and Al3+ 1.386 mg/L; the 96 h halflethal concentrations are Cu2+ 0.563 mg/L, Zn2+ 2.874 mg/L and Al3+ 1.350 mg/L. The 96 h safe concentrations are Cu2+0.563 mg/L, Zn2+ 2.874 mg/L, and Al3+ 1.350 mg/L. Thus, the order of toxicity to loach from strong to weak is Cu2+>Al3+>Zn2+. For loach exposed to a Cu2+-Zn2+-Al3+ mixed solution, the 48 h, 72 h, the 96 h joint toxicity effect performances are respectively antagonistic action, antagonistic action, and synergy. The safe Zn2+ concentration of loach is 0.029 mg/L, which is far lower than 0.10 mg/L, the National Standard of Fishery Water Quality in China.
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Received: 12 July 2016
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