Effect of Complexing Agents on the Acute Toxicity of Copper to Common GuppyLebistes reticulatus(PETERS)

摘要

AbstractThe acute toxicity of copper and copper plus complexing agents to common guppyLebistes reticulatuswas studied for 96 h by a static bioassay technique. The addition of complexing agents viz. disodium salt of EDTA, citric acid, sodium thiosulphate and glycine in Cu2+solutions caused a great decrease in the per‐cent mortality as compared to that of Cu2+test solutions alone. 10 mg/l of complexing agent was added in each copper concentration in all the test series. The 96 h LC50values and 95 confidence limits in mg/l of Cu2+plus were 1.23 (0.95…1.65) for Cu2+alone; 4.30 (4.04 … 4.55) for Cu2+plus EDTA; 1.94 (1.69 … 2.18) for Cu2+plus citric acid; 3.44 (2.96 … 3.74) for Cu2+sodium thiosulphate and 2.29 (2.22 … 3.02) for Cu2+p