The Influence of pH on the Cadmium‐Repressed Growth of the Alga Coelastrum proboscideum

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Abstract
The inhibition of growth by different concentrations of CdCl2 in the range 4,5 × 10−7 to 5.6 × 10−7M was studied in the green alga Coelastrum proboscideum Bohlin in inorganic media at pH 4.3, 5.3 and 6.2. The factorial destgn of the experiments was evaluated as an analysis of 22 factors. Below pH 4.0 and above pH 6.5 growth was depressed without adding Cd. Cd concentrations exceeding 5.6 × 10−8M reduced algal growth significantly with a 50% inhibition at 5.6 × 10−7M Cd. The Cd concentration of 5.6 × 10−7M was less toxic at pH 6.2 than at pH 5.3 and 4.3, thus revealing a negative interaction between protons and Cd.