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: -
Endpoint summary
Administrative data
Description of key information
Additional information
Phototransformation in air/water/soil has not been investigated because direct and indirect exposure of the environmental compartments to Direct Red 23 (DR23) is unlikely, based on the CSR and risk management measures reported.
However, a possible primary source of environmental pollution of DR23 can be represented by accidental releases of industrial waste water and secondary by release during washing of dyed textile. Photodegradation does not seem to be a relevant process for the degradation of DR23. However, it has been reported that the addition of oxidants to aqueous solutions of commercial azo dyes, increases the photodegradation rate of azo dyes substantially (see 5.6, Clausen et al, 2009).
Due to the same reasons given above, i.e. direct and indirect exposure of the environmental compartments to DR23 is unlikely, hydrolysis is not expected to be an important removal process that characterizes DR23 in the aquatic environment.
A read across was nevertheless proposed with the structural analogue Direct Red 262 (DR262): DR262 undergoes slow hydrolysis, with a half-life greater than one year at 25 °C and pH values of 4, 7, 9. At 50°C and after 2.4 hours only around 1% of the sample was hydrolysed at pH 4, 7, 9. Therefore, hydrolytic degradation is unlikely, given that tests indicate a lack of hydrolysis under any of the tested conditions (BASF, 1992).
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