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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

EC(50) = 14 mg/l 72 h

Key value for chemical safety assessment

Additional information

A study of acute toxicity on algae (1997, Huntsman) was performed on similar substance 3 following a modified version of OECD Guideline No. 201, as to quantify the algicidal effect of the test substance, but also the growth inhibition effect caused by reduced light intensities in the coloured test solutions. The same growth inhibition of Scenedesmus subspicatus was observed when the algae grew in test water without test substance, but under reduced light intensities by the filter effect of the coloured test media as in the second parallel experimental part, where the algae grew in the test media with dissolved test substance. In conclusion, this modified algal test has demonstrated that the observed growth inhibition effect of the test substance FAT 40'564/A on Scenedesmus subspicatus was caused with high possibility only due to an indirect effect, the light filter effect in the coloured test solutions. Thus, a toxic effect of the test substance on the algal cells can be excluded up to the highest test concentration of nominal 100 mg test substance/I (mean measured 80 mg/l).

based on read across considerations same results apply to target substance