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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Acutely harmful to algae

Key value for chemical safety assessment

EC50/LC50 for freshwater algae:
12.3 mg/L
EC10, LC10 or NOEC for freshwater algae:
1 mg/L

Additional information

Algae gowth inhibition of the test item was investigated in a 72-h GLP study following OECD TG 201. Due to the low water solubility, the test concentrations were prepared as water accomodated fractions (WAF) as described in OECD TG 23. The test concentrations could not be chemically verifed due to the lack of a sufficiently sensitive method to determine the test substance in the test solutions up to its saturation limit. Therefore, the results are based on loading rate ("nominal concentrations"). Based on growth rate, the 72-h NOELR was 1 mg/L and the ErL50 was 12.3 mg/L (BASF, 2011).

Results reported by Dave et al. (1979) regarding effects of Adogen 283 on Chlorella emersonii were disregarded mainly due to the poor documentation and the unsuitable test period of 48 h.