Mitigating Effect of physico‐chemical factors ON Ni²⁺ Hg²⁺ and Cu²⁺ toxicity in cylindrospermum Iu 942

Abstract

Physico‐chemical factors affecting the toxicity of Ni²⁺, Hg²⁺ and Cu²⁺ to Cylindrospermum IU 942 were investigated. Hg²⁺ was more toxic to the test organism than Ni²⁺ and Cu²⁺ (Hg²⁺> Ni²⁺> Cu²⁺). The toxicity of metals to Cylindrospermum was mitigated by pH, chelators and amino acids. Investigated heavy metals were more toxic to the growth of Cylindrospermum at acidic pH than at alkaline pH. EDTA was a more effective chelator than citrate. Glutamine was found to play a protective role against metal toxicity.