Registration Dossier
Registration Dossier
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Reaction mass of sodium(E)-6,7'-carbonylbis(azanediyl)bis(4-hydroxy-3-((E)-phenyldiazenyl) naphthalene-2-sulfonate) and disodium 3-[(4-acetamidophenyl)azo]-4-hydroxy-7-[[[[5-hydroxy-6-(phenylazo)-7-sulphonato-2-naphthyl]amino]carbonyl]amino]naphthalene-2-sulphonate and disodium 7,7'-(carbonyldiimino)bis[4-hydroxy-3-(phenylazo)naphthalene-2-sulphonate]
EC number: 939-268-7 | CAS number: -
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Non-toxic to microorganisms.
Key value for chemical safety assessment
- EC10 or NOEC for microorganisms:
- 2 000 mg/L
Additional information
The inhibitory effect of Direct Red 23 (DR23) 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 Direct Red 239 (Clariant 1989 and Kemira 1989) confirm the conclusion that DR23 could be considered as non-toxic to microorganisms.
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