Trisodium 5-[[4-chloro-6-(ethylphenylamino)-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(2-sulphonatophenyl)azo]naphthalene-2,7-disulphonate

Endpoint summary

Description of key information

Reactive Red 024:1 is considered non biodegradable and hydrolytically stable. In general, textile chemicals especially textile dyes are designed to be no organic substrates for microorganisms, fungi and higher organisms. Therefore, these substances are considered to be non-biodegradable. Nevertheless, basic studies to assess biodegradability of FAT 40034/A have been performed. A key study reported biological elimination of FAT 40034/A as 12 %. BOD5 and COD values of 0and 798 mgO₂/g were reported in two support studies, respectively. The relevant BOD₅/COD quotient is <0.5 , therefore the substance is not indicative of rapid degradation. Taking the data from key study and supporting studies into account, FAT 40034 is considered to be not biodegradable. Additionally, by the nature of their design and use, reactive 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.