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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

IC50 3h > 100 mg/l

Key value for chemical safety assessment

EC50 for microorganisms:
100 mg/L

Additional information

The inhibitory effect of the substance under registration on aerobic waste-water bacteria was investigated in a respiration test, according to OECD Guideline for Testing of Chemicals No. 209. The test article showed only a slight inhibition (6.3 %) of the respiration rate up to a concentration of 100 mg/l, therefore the IC50 was determined > 100 mg/l (Ritter A., 1989).

For completeness sake, supporting studies were reported on analogous substance 3a-A(Na). Justification for Read Across is given in Section 13 of IUCLID.

All of those studies demonstrate that the substance does not inhibit the degradation activity of activated sludge in concentrations higher or equal to 100 mg/l.