Abstract
Effect of calcium hardness (120, 250, 350 and 750 mg/L) on the toxicity and accumulation of lead, cadmium and chromium to Labeo rohita (Hamilton) was investigated in the laboratory. For lead treatment, no mortality occurred, whereas 50% and 20% mortality occurred at 120 and 250 mg/L calcium hardness, respectively for cadmium treatment. In chromium treatment, 10% mortality was recorded at 120 mg/L calcium hardness. The minimum accumulation of Pb, Cd and Cr in whole fish occurred at 350 mg/L hardness as compared to other treatments.
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