Registration Dossier
Registration Dossier
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EC number: 274-105-7 | CAS number: 69762-08-9
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Non-readly biodegradable
Key value for chemical safety assessment
Additional information
Acid Yellow 049 is an azo pyrazole dye, used in textile area.
No information is available on the environmental behaviour of Acid Yellow 049, however, by the nature of their design and use, dyes are not intended to be readily biodegradable as this would assist in the rapid destruction of the dyestuff, rendering it unfit for purpose. As such, it is accepted that such substances are not readily biodegradable under relevant environmental conditions. A published study (Pagga& Brown, 1986) describes the results of the testing of 87 dyestuffs in short-term aerobic biodegradation tests. The authors of this publication concluded that dyestuffs are very unlikely to show any significant biodegradation in such tests and that there seems little point in carrying out such test procedures on dyestuffs. There are ISO, European, American (AATCC) and national standards for the colour fastness of dyes. Dyes are required to have specific fastness properties. If the dyes were biodegradable, it would not be possible for them to have these fastness properties.
The QSAR based screening criterion for identifying substances for persistency (P and vP) confirmed that the substance is expected to be not readily biodegradable.
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