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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

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.