Registration Dossier
Registration Dossier
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EC number: 279-131-2 | CAS number: 79295-99-1
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Not inherently biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
No studies on the "Biodegradation in water" are available for the Target substance in itself.
Nevertheless studies have been conducted with analogue molecules (Similar Substance 02 and Similar Substance 03). Further information are reported in the Read Across justification attached to section 13.
Two tests on inherent biodegradability are available: one on Similar Substance 03, chosen as key study due to the major structural similarity with the Target Substance, and a second one carried out on Similar Substance 02. Missing the Ready biodegradability test. Nevertheless, 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.
In both studies the inherent biodegradability of the test substance was determined in a 28 days Modified MITI (II) – test , according to the OECD Guideline for Testing of Chemicals, No. 302C.
In the key study the test substance was tested in a concentration of 33.90 mg/l, while in the supporting study the concentration of the test substance was 30 mg/l.
In both cases, the mean value of the biodegradation of the test substance after 28 days was 0 % and the biodegradation of the reference substance after 14 days was 90 %.
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