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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72hr EC50 for Skeletonema costatum was calculated to be >300.82 mg/l based on the effect of the acetate ion.

Key value for chemical safety assessment

EC50 for marine water algae:
300.82 mg/L

Additional information

In a GLP compliant, guideline 72 hr acute toxicity test of the test substance to the marine algal species Skeletonoma costatum, no significant effect was seen up to the highest test concentration of 1000 mg/L (Beslagic, 2005). Therefore the EC50 was determined to be >1000 mg/L for the test substance. The 72hr EC50 for Skeletonema costatum was calculated to be >300.82 mg/l based on the effect of the acetate ion.

The reported EC50 was recalculated in order to report the effect concentrations based on the concentration of the acetate ion. The EC50 was adjusted for the molecular weight of the acetate compared to the parent molecule and also the fact that the test substance is only 50% potassium acetate.

Although it is preferable to have data from tests on freshwater algal species, this study is considered suitable for use as a key study as the results are within the same range as for freshwater studies in fish and Daphnia.