Registration Dossier
Registration Dossier
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EC number: 269-284-3 | CAS number: 68214-04-0
Endpoint summary
Administrative data
Description of key information
The substance was not inherently biodegradable (Ciba 1995). However degradation by the environmental isolate Bacillus lentus BI377 lead to formation of low molecular weight metabolites that could be completely mineralized.(Oturkar 2010).
In a hydrolysis study at pH 4 some degradation of the substance was seen (Laus 2018). This was confirmed in a repeat study (Kemira 2018), where the degradation products were identified as (Cl groups --> OH groups):
2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-6-[[4-[[1,4-dihydro-6-[[8-hydroxy-3,6-disulfo-7-[(2-sulfophenyl)azo]-1-naphthalenyl]amino]-4-oxo-1,3,5-triazin-2-yl]amino]phenyl]amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(2-sulfophenyl)azo]-, hexasodium salt (9CI) and
2,7-Naphthalenedisulfonic acid, 4,4'-[1,4-phenylenebis[amino(1,6-dihydro-6-oxo-1,3,5-triazine-4,2-diyl)imino]]bis[5-hydroxy-6-[(2-sulfophenyl)azo]-, hexasodium salt (9CI)
The hydrolyzed form can be further degraded under a direct nucleophilic attack by ozone resulting in oxidation and cleavage of azo group and aromatic ring, while the triazine group still remains in the solution even after prolonged oxidation time (120 min) due to its high resistance to ozonation. Phenol, 1,2-dihydroxysulfobezene, 1-hydroxysulfonbezene were detected as the degradation intermediates, which were further oxidized by O3 and∙OH to other open-ring products and then eventually led to simple oxalic and formic acid (Zhang 2007).
Additional information
The logKoc was set at 1.3, while an actual measurement was technically not possible (elution within the dead time)
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