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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

EC50 > 2000 mg/l, nominal

Key value for chemical safety assessment

EC50 for microorganisms:
2 000 mg/L
EC10 or NOEC for microorganisms:
2 000 mg/L

Additional information

The inhibitory effect of similar substance 02 on the oxygen consumption of activated sludge microorganisms of a municipal sewage treatment plant was investigated under aerobic static conditions (Clariant 2002); at 3h EC20 is > 2000 mg/L, EC50 is > 2000 mg/L and EC80 is >2000 mg/L.

The other studies reported on structural analogues/surrogates similar substance 01 confirm the conclusion that Direct Red 81 could be considered as non-toxic to microorganisms.