Registration Dossier
Registration Dossier
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 276-127-2 | CAS number: 71873-51-3
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Expected as not readily biodegradable.
Key value for chemical safety assessment
Additional information
The substance is a pyrazole azo dye derivative. The substance is not expected to be ready biodegradable based on its chemical structure and its specific function. Commonly, dyes undergo a primary transformation, i.e. discolouration due to the interrupting the conjugation. Nevertheless, the degradation process involves more steps and takes more time.
The QSAR based screening criterion for identifying substances for persistency (P and vP) confirmed that the substance is expected to be persistent.
The test item was investigated for biodegradability potential in the inherently Zahn-Wellens test, over a period of 28 days. The substance was inoculed with a mixed population of activated sewage sludge microorganisms. Based on the DOC removal, the substance attained 71 % degradation within 14 days; during the subsequent period, the DOC removal ranged between 69 - 77 %.
Based on the chemical characteristics of the substance, it is likely that a a primary transformation occurred, followed by the substance adsorption. Therefore, the study outcomes cannot be considered as complete representative for the substance under registration.
In any case, the substance can more than likely be considered as not readily biodegradable.
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
