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Abstract
The effect of complexans(NTA,EDTA) on the toxicity of nickel chloride and sulfate to carp (Cyprinus carpio L.) , and on the accumulation of metals in fish at lethal level concentrations was studied. The toxicity of nickel salts to carp was relatively lower, and nickel chloride was more toxic than nickel sulfate. The concentration of metals in fish exposed to nickel chloride and sulfate was remarkably lower than those in the fish exposed to another some heavy metals, such as Cd, Pb, Zn, Cr and Al which were reported in the previous papers. The inhibition of metal accumulation by the presence of complexans was recognized in each part of the fish, but no significantly decrease of mortality of fish to the toxicity of nickel salts.