[No public or meaningful name is available]

Endpoint summary

Description of key information

The substance FAT 40851/A can be considered as environmentally stable with regard to abiotic degradation pathways. In additiion, the hydrolysis properties of the test item FAT 40851/A were tested in a valid GLP study in accordance with EU Method C.7. The substance was found to be hydrolytically stable at pH 7 with a predicted half-life of 638 day at 25 °C. The half-life could not be accurately determined at pH 4, but the substance tended to be hydrolytically unstable under acidic conditions. At pH 9, the substance was hydrolytically stable and the predicted half-life at 25 °C was 721 days. It is concluded that FAT 40851/A tends to be hydrolytically stable under relevant environmental conditions with a tendency for less stability in acidic environments. Screening studies on the ready and inherent biodegradability of the test item FAT 40851/A under aerobic conditions gave no evidence of relevant biodegradability of the substance. It is hence concluded that the substance shows limited to no potential for biodegradation under aerobic environmental conditions. A study on the bioaccumulation of FAT 40851/A is lacking. The substance has a very low octanol-water partitioning coefficient with a log value -4. This value is clearly below the recommended threshold value of log Kow of 4.5 indicating that the substance is unlikely to be bioaccumulative or very bioaccumulation in accordance with the screening criteria provided in the technical guidance by ECHA (Guidance on information requirements and chemical safety assessment, R.11). The determination of the adsorption coefficient (KOC) of FAT 40851/A was performed according to the OECD Guideline for the Testing of Chemicals, No. 121, Estimation of the Adsorption Coefficient (KOC) on Soil and Sewage Sludge using High Performance Liquid Chromatography (HPLC), January, 2001, the EC Directive 2001/59, C.19 (August 2001) and Council Regulation (EC) No. 440/2008, 30 May 2008, Part C, Methods for the determination of physico-chemical properties, C.19. Under the conditions of the test, the test item FAT 40851/A was found to elute as one peak at a retention time of about 0.36 minutes.  FAT 40851/A was not retained under the chromatographic conditions of the test and was eluted at the dead time. The KOC of FAT 40851/A  was therefore determined to be lower than that of the lowest reference item used (acetanilide). Therefore, the log KOC of the test item is <1.25, which is equal to a KOC value of <18. This value indicates that FAT 40851/A is very mobile.

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 40851 was tested in a Zahn Wellen test as well as Monometric Respirometric test for ready biodegradability. The outcome of these results indicated no biodegradation potential. FAT 40851 was also found to be hydrolytically stable at environmentally relevant conditions, while the substance was found to have a low organic carbon-water partitioning coefficient (log Koc <1.25).