Registration Dossier
Registration Dossier
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EC number: 274-503-0 | CAS number: 70247-74-4
Endpoint summary
Administrative data
Description of key information
The biodegradation of the test substance FAT 20035/E in a OECD 302C test after 28 days was 9 %. The BOD5 and COD of FAT 20035/E was found to be 0 mg O2/g and 1302 mg O2/g, respectively, in tests performed following internal guidelines. The inherent biodegradability test and the BOD5/COD ratio (<0.5) indicate that the test substance FAT 20035 is not biodegradable.
Additional information
By the nature of their design and use, textile dyes are not intended to be readily biodegradable as this would assist in the rapid destruction of the dyestuff, rendering it unfit for purpose. 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. 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.
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