Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Endpoint summary
Administrative data
Description of key information
FAT 41047/A TE is not readily 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.
Nevertheless, biodegradbility of FAT 41047/A was tested for ready biodegradation. The ready biodegradability of FAT 41047/A TE was tested using the CO2 Evolution Test (OECD Test guideline 301B). The test item was added to two test vessels at the concentration of 25 mg/L (equivalent to 15.1 mg of Total Organic Carbon/L). Two control treatments containing only the inoculum, one reference item treatment and one toxicity control treatment containing the test item and the reference item were also tested. All the treatments were added with equal volume of inoculum which was collected from the secondary effluent treatment plant receiving predominantly domestic sewage. Treatment mixtures were aerated for 29 days with carbon dioxide (CO2) free air. The CO2 released was trapped in a series of bottles containing barium hydroxide, which were connected to the outlet of each test vessel. The residual barium hydroxide was measured on Days 3, 6, 8, 10, 13, 16,20, 24, 27 and 29 after the initiation of the test.
The mean percent degradation of test item was 8.30% at the end of test while, the percent degradation of reference item was 100.29% and the toxicity control was 54.71% at the end of the test. Based on the results, it was concluded that the test item, FAT 41047/A TE is not readily biodegradable as 8.30% mean degradation was achieved at the end of test which is less than 60% pass level in 10-day window period within the 28-d period of the test.
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