Registration Dossier
Registration Dossier
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Reaction mass of 5,5'-{(phenylmethanediyl)bis[benzene-4,1-diyl-diazene-2,1-diyl]}bis{1-[3-(dimethylamino)propyl]-4-methyl-6-oxo-3-(pyridinium-1-yl)-1,6-dihydropyridin-2-olate} hydrochloride and 5,5’-[3,4’-(phenylmethanediyl)diphenylene]bis(diazene-2,1-diyl)bis{1-[3-(dimethylamino)propyl]-4-methyl-6-oxo-3-(pyridinium-1-yl)-1,6-dihydropyridin-2-olate} hydrochloride
EC number: 700-312-3 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Based on long-term experiences made in the paper dyeing process as well as in actually operating paper mill WTPs, the high adsorption capacity of cationic azo paper dyes has been proven. Therefore the conduct of a laboratory-based adsorption/desorption study is being waived based on scientific grounds. For the substance registered an indicative log Koc value of 6 shall be used for risk assessment.
Key value for chemical safety assessment
Additional information
As a cationic azo paper dye the substance registered is highly adsorptive to cellulose fibres. Furthermore, with reference to the observed highly efficient removal in a mechanical-biological wastewater treatment process, the high level of adsorption to activated sludge of cationic azo paper dyes in general, and of the substance registered in particular, also is evidenced.Taken together all the evidence retrieved from long-term experiences made in the paper dyeing process as well as in actually operating paper mill WTPs, the conduct of a laboratory-based adsorption/desorption study is considered as not necessary on scientific grounds and shall therefore be waived. For the substance registered an indicative log Koc value of 6 shall be used for risk assessment, i.e. the substance is considered to be highly adsorptive to sludge and soil.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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