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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72 h EbC50 (biomass) and ErC50 (growth rate) for Scenedesmus subspicatus were found to be >100 mg/L. Further, the NOEC for growth rate was found to be 100 mg/L .

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L
EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

A study was conducted to determine the acute toxicity of the test substance to the algae Scenedesmus subspicatus (new name: Desmodesmus subspicatus) according to EU Method C.3, in compliance with GLP.Innocula of the algae were exposed to a nominal concentration of 100 mg/L test substance for 72 h under static conditions. Quantification of the applied concentration was carried out using TOC determination at 0 and 72 h. The cell densities were measured at 24 h intervals. Inhibition of the algal population was measured as reduction in growth and growth rate, relative to control cultures grown under identical conditions.The measured concentration of the test substance was 106% of nominal values at 72 h. Under the conditions of the study, the 72 h EbC50 (biomass) and ErC50 (growth rate) for Scenedesmus subspicatus were >100 mg/L (nominal). The NOEC for growth rate was 100 mg/L (nominal) (Caspers, 1999).