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Ecotoxicological information

Toxicity to aquatic plants other than algae

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From two studies with four species, the 7 to 8 day NOEC values (growth) to aquatic plants range from 0.1 to 0.5 mg/L, based on tests with potassium dichromate and sodium chromate.

Where comparison is possible, the toxicity of sodium chromate or sodium dichromate, when expressed on a total chromium basis, does not appear to be significantly different from that of potassium dichromate. This is as would be expected if the equilibria between the chromate and dichromate anions are established in the test medium. Little information is available for ammonium dichromate and chromic acid, but it would be expected that their toxicity would be similar to that of the other chromates/dichromates, when expressed on a total chromium concentration basis.