Environmental factors reducing the toxicity of zinc toStigeoclonium tenue

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Abstract
The influence of pH over the range 6·1 to 7·6, magnesium, calcium and phosphate on the toxicity of zinc to Stigeoclonium tenue has been shown to differ in a zinc tolerant population as compared with a zinc sensitive one. With the zinc sensitive population a rise in pH from 7·1 to 7·6, and rises in magnesium and calcium bring about a slight reduction in the toxicity of zinc, the effect being most pronounced with calcium. Rises in all four parameters bring about a reduction in the toxicity of zinc to the zinc tolerant population, the reduction being marked in the cases of magnesium, calcium and phosphate.