Disodium 1-amino-4-[[4-[(2-bromo-1-oxoallyl)amino]-2-sulphonatophenyl]amino]-9,10-dihydro-9,10-dioxoanthracene-2-sulphonate

Endpoint summary

Description of key information

FAT 92349/B was determined to be not readily biodegradable as well as hydrolytically stable.

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, basic studies to assess biodegradability, hydrolytic stability and adsoprtion coefficient of the substance have been performed. A key study to evaluate the inherent biodegradability indicated, FAT 92349/B to be not inherently biodegradable. Further, multiple studies evaluating BOD5 and COD are available. The relevant BOD5/COD quotient is <0.5 in all cases, indicating substance to be not rapidly degradable. Hence, taking the data from key and supporting studies into account, the substance FAT 92349/B is considered to be neither rapidly nor inherently biodegradable. The hydrolytic half life for the substance was estimated to be > 1 year at pH 7 and 25 °C, while the adsorption coefficient (log10 Koc) of the test substance was estimated to be -1.45.