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The in vitro effects of individual heavy metal ions as well as their combinations on catalase activity were investigated. Copper was found to be the strongest inhibitor of catalase activity followed by mercury, iron, chromium and cadmium. Copper toxicity on catalase activity was reduced in the presence of all the other metal ions. However, the addition of cadmium, chromium, iron, manganese, lead to mercury and cadmium, iron, manganese, nickel, lead, zinc to chromium increased their inhibitory effects on catalase activity.
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Singh et al. (1982) studied this question.
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