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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

With high probability acutely not harmful to algae.

Key value for chemical safety assessment

Additional information

Two studies according to OECD 201 on Desmodesmus subspicatus and Scenedesmus subspicatus are available. The results of a limit test by MOE (2001) with 1 mg/L test substance and a static exposure accomplished by BASF AG (1999) indicate that the test substance has no toxic effects in the range of its water solubility (NOEC >1 mg/L and EC50 >100 mg/L, respectively). A slight effect on the growth (based on biomass) was observed in Desmodesmus subspicatus at a threshold value below nominal 100 mg/L [EbC10 (72 h) = 64.1 mg/L], which probably is an effect of reduced light intensity due to coloration or clouding in test water at high substance concentrations.

This is in line with the results of a OECD 29 test: The transformation/dissolution concentrations of the inorganic building blocks Ni and Sb at a loading rate of 100 mg/L are far below of the acute ERVs.