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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The test substance FAT 40000 is considered to be not biodegradable and hydrolytically stable.

Additional information

A key study reported biological elimination of FAT 40000 as 0 %. BOD5 and COD values of 3 and 402 mg O2/g were reported in two other key studies respectively.

 

The relevant BOD5/COD quotient is <0.5 , therefore the substance is not indicative of rapid degradation.

 

Taking into consideration the data from key study and supporting studies, the test substance FAT 40000 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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