Registration Dossier
Registration Dossier
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EC number: 229-398-6 | CAS number: 6507-79-5
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The substance can be considered as non ready biodegradable.
Key value for chemical safety assessment
Additional information
Similar substance has been assayed by one screening study, i.e. BOD5, and by a Zahn-Wellens test. The biodegradability potential of the test item has been assayed following the DOC removal, in the Zahn-Wellens test. After a period of 28 days, the bioelimination of the test substance resulted to be 44.1 %; however, after 3 hours, 35.3 % of substance removal has been observed. On the basis of the study outcomes, the substance resulted to be primarily eliminated by adsorption. A conclusion regarding biodegradability potential cannot be reached. According to the Guidance on information requirements and Chemical Safety Assessment, Chapter R.7b: Endopoint specific guidance (Version 1.1, May 2008), information on the 5-day biochemical oxygen demand (BOD5) can be used for classification purposes only when no other measured degradability data are available. Thus, priority is given to data from ready biodegradability tests and from simulation studies regarding degradability in the aquatic environment. The BOD5 test is a traditional biodegradation test that is now replaced by the ready biodegradability tests. The information on BOD5 assay have been reported fopr completeness sake. The study outcomes confirm that the substance is not expected to be readly biodegradable.
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