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: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Kow method:
Koc: 3.854
logKoc: 0.586
Key value for chemical safety assessment
- Koc at 20 °C:
- 3.854
Additional information
Koc of Direct Red 23 (DR23) neutral form was calculated using EpiSuite 4.1., the suite of physical/chemical property and environmental fate estimation programs developed by the EPA’s Office of Pollution Prevention Toxics and Syracuse Research Corporation (SRC).
DR23 is expected to be a substance with a low potential for adsorption, as confirmed by the partition coefficient log Kow of 0.0019 (R&C, 2012).
Based on REACH regulation annex VIII column 2 (specific rules for adaptation from column 1) the study need not be conducted based on the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient).
[LogKoc: 0.586]
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