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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Acutely very toxic for algae

Key value for chemical safety assessment

EC50/LC50 for freshwater algae:
0.015 mg/L
EC50/LC50 for marine water algae:
0.2 mg/L
EC10, LC10 or NOEC for freshwater algae:
0.003 mg/L

Additional information

Several algae toxicity studies with Desmodesmus subspicatus are available, mainly performed at BASF AG. In some of the studies Cremophor was used as solvent. There is no evidence that the solvent influenced the toxicity of the substance. The exposure concentrations were not verified in any of the studies.

Since more than one EC50 value for the same endpoint and species is available, according to the EU-Technical Guidance Document (ECB, 2003) the geometric mean of the results can be used to calculate a 72-h ErC50 of 0.015 mg/L. In analogy to the EC50, the geometric mean was also calculated for the available five ErC10 values. The chronic effect value used for the risk assessment is 0.0032 mg/L.

With the marine algae species Dunaliella parva and Amphora coffeaeformis results of growth inhibition tests are available. Related to biomass at test end, the 96-h EC50 was ca. 0.2 mg/l for Dunaliella parva and ca. 0.8 mg/l for Amphora coffeaeformis (Finlay and Callow, 1996). The efect value for Dunaliella parva was selected as key study.