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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

OECD Guideline 201, GLP, key study, validity 1:
No effects were observed on Pseudokirchneriella subcapitata up to the solubility limit of the test substance.

Key value for chemical safety assessment

Additional information

To assess the toxicity of the registered substance to aquatic algae, one valid study is available.

This GLP study, assessed as a key study, was performed on the registered substance according to OECD Guideline 201. The unicellular freshwater green alga Pseudokirchneriella subcapitata was exposed to a saturated solution of the test substance with a nominal loading level of 2 mg/L and a control, under static conditions, over a period of 72 hours. The concentrations of the saturation solution of the test substance and the control were analytically verified via GC-MS at the start and at the end of the exposure. The recovery rate of the test substance at the start was 101% and at the test end it was determined to be 50%. Therefore, all effects values were based on geometric mean measured test substance loading rate. According to the results of this study, only 3% inhibition of the growth rate was observed at the geometric mean measured concentration of 1.42 mg/L. Therefore, the 72h-ErC10 and 72h-ErC50 were determined to be greater than this value, greater than the solubility limit.