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: -
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
LC50 > 100 mg/L
Key value for chemical safety assessment
Fresh water fish
Fresh water fish
- Effect concentration:
- 100 mg/L
Additional information
In the Clariant study of 2002 Direct Red 23 (DR23) was tested on freshwater fish at the limit dose of 100 mg/L. At this concentration no adverse effects were observed, so an LC50 value >100 mg/L was derived.
The conclusion that DR23 is not toxic to fish is confirmed by the supporting studies of Little at al. (1974 and 1972, respectively), as well as the study on the structural analogue Direct Red 239 (Kemira 1989).
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