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The effects of Ca, Mg, Na and pH on the acute toxicity of Ni to Daphnia magna were investigated in a series of 48-h immobilization assays in synthetic test solutions. Both Ca and Mg reduced Ni toxicity, while Na did not. Ni toxicity was not affected in the pH range of 5.7–7.5, but a further increase of pH up to 8.1 resulted in an increase of toxicity of the free Ni 2+ ion. Based on the results...
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