Registration Dossier
Registration Dossier
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EC number: 284-915-2 | CAS number: 84989-26-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Not ready biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
The ready biodegradation potential of the Acid Brown 355b (ABr355b - EC: 280-689-4) was investigated in a study conducted according to the OECD Guideline 301 A, Modified AFNOR Test. Under test conditions, no biodegradation was observed (0 % after 28 days, based on the DOC-removal), thus ABr355b resulted as not readily biodegradable (Huntsman Textile Effects (Germany) GmbH, 1986).
All the tests available were performed on the ABr355b (EC 280-689-4), trisodium salt: chromate(3-),[3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-2-hydroxy-5-nitrobenzenesulfonato(3-)][3-hydroxy-4-[(2-hydroxy-1-naphthalenyl)azo]-7-nitro-1-naphthalenesulfonato(3-)]-, trisodium.
The reference substance under registration is the Acid Brown 355 (ABr355 - EC 284-915-2), the form which can have a variable number of the sodium atoms. Thus, although it has been appointed a different EC number to the ABr355b trisodium salt form (EC 280-689-4), it can be considered as “included” into the structure variability of the ABr355 (EC 284-915-2). In this context, the use of the experimental data available on the ABr355b (EC 280-689-4), in order to assess the ABr355 (EC 284-915-2), can be considered as not a read across, but an evaluation on one of the possible forms of the substance under REACH registration.
Furthermore, based on the experience in the manufacture of the ABr355, the most frequent form is the trisodium salt.
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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