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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72-h ErC50 is 8.8 mg/L and the 72-h NOErC is 1 mg/L in the freshwater species Pseudokirchneriella subcapitata (tested as: Selenastrum capricornutum), this corresponds to a 72-h ErC50 of 4.8 mg/L and a 72-h NOErC of 0.54 mg/L based on fluoride. The 72-h ErC50 of 4.8 mg F/L is used in the assessment.

Key value for chemical safety assessment

Additional information

One GLP-compliant guideline study (OECD 201) in which the concentrations were analytically verified is available for toxicity in algae. The 72-h EC50 for biomass integral and growth rate were 3.2 and 8.8 mg/L, respectively, in the freshwater species Pseudokirchneriella subcapitata (tested as: Selenastrum capricornutum). The 72-h NOEC, based on biomass integral and growth rate were both 1.0 mg/L (Solvay, 2008b). It was a static test and analytical monitoring has been performed.