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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

The key study was performed with Demodesmus subspicatus. It resulted in an EC50 based on the growth rate of > 100 mg/L (statistical evaluation of the measured fluorescence data resulted in an extrapolated ErC50 of 176 mg/L; BASF AG, 1988, report no. 2/0518/88). The 72h ErC10 was 19 mg/L. Another study by BASF AG using Desmodesmus subspicatus was performed as a range finding study which was not conducted according to current guidelines (deviations for example spacing factor, concentration range tested etc.). Further, the test results were not statistically evaluated and the EC50 of 45.2 mg/L refers to fluorescence values. Hence, this range finding test was disregarded.

A study on the marine alga Skeletonema costata resulted in a 72 -h ErC50 of 410 mg/L and a 72 -h ErC10 of 89 mg/L (BASF AG, 2002, report no. V2489/04). This result is supported by Eide-Haugmo et al. (2009) who performed a study with the same species. The 72 -h ErC50 was determined to be 141 mg/L.

It can be concluded that the substance is with high probability not acutely harmful to algae in freshwater and marine systems.