Registration Dossier
Registration Dossier
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EC number: 249-171-5 | CAS number: 28706-25-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Not readily biodegradable according to OECD criteria. Poorly biodegradable. Poorly eliminated from water.
Key value for chemical safety assessment
- Biodegradation in water:
- not biodegradable
Additional information
The biodegradability of the structurally related substance "Analogue substance 1" was investigated in two guideline studies according to OECD 302B. After a test duration of 28 days, the test substance was degraded up to 7% (based on DOC removal) and 18% (based on CO2 evolution), respectively (Clariant 984/a-01, 2002 and Clariant 79/a-O7, 2007). These results are considered to be adaptable for the test substance as well due to their structural similarities. Based on these results, the test substance is considered to be "not readily biodegradable according to OECD criteria" and "poorly biodegradable".
Moreover, 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 during its application. As such, it is accepted that these 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, theQSAR predictions performed on the substance confirm that it is not ready-biodegradable.
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