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Environmental fate & pathways

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The biological elimination i.e. percent degradation of FAT 20013 is found to be 0 %. BOD5 and COD value of 19 and 824 mgO2/g test mat. was determined for FAT 20013.Based on the BOD5/COD quotient which is not >0.5, the substance is not indicative of rapid degradation. Taking the data from % degradation test and BOD5/COD quotient into account, the test substance FAT 20013 is considered to be not biodegradable.

Additionally, by the nature of their design and use, acid 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.

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