Registration Dossier
Registration Dossier
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EC number: 290-924-2 | CAS number: 90294-40-9
Endpoint summary
Administrative data
Description of key information
Additional information
The biodegradation of the analogue substance 1 in a OECD 302B test after 28 days was 0 %. The BOD5 and COD of the same substance was found to be 0 mg O2/g and 1100 mg O2/g respectively in tests performed according to guidelines, ISO 5815 and EEC 92/69/C.6 (1992) respectively.
The inherent biodegradability test and the BOD5/COD ratio (<0.5) indicate that the analogue substance 1 not biodegradable.
Similarly, analogue substance 2 was tested for BOD5/COD ratio The ratio of these values was equivalent to 0.03, suggesting low biodegradation potential of the substance under the test conditions.
Additionally, by the nature of their design and use, acid 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.
Finally, based on the read across considerations the same results apply to Acid Orange 144 and the substance is considered not readily biodegradable.
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