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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

(96-h) EC50: 160 mg/l growth rate Desmodesmus subspicatus, reliability 2.
NOEC: 32 mg/l growth rate Desmodesmus subspicatus, reliability 2.

Key value for chemical safety assessment

Additional information

A 96-hour EC50 value of 160 mg/l has been determined for the effects of the test substance on growth rate of Desmodesmus subspicatus (tested as Scenedesmus subspicatus) cultures. The value was obtained by extrapolation to above the highest test concentration from results obtained in test media prepared by direct dispersion of the test substance. The use of other methods of test media preparation did not have a significant effect on the test result. A NOEC of 32 mg/l has been estimated from the test results. In a separate study, conducted by the same laboratory, a 96-hour EC50 value of >10 mg/l and NOEC ≥10 mg/l have been determined for the effects of the test substance on growth rate and of Desmodesmus subspicatus. The results of these tests are interpreted with reference to nominal concentrations of the test substance. However the test substance is susceptible to hydrolysis and it is likely that the test organisms were primarily exposed to a mixture of the parent compound and the hydrolysis products of the substance.