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Environmental fate & pathways

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The test item FAT 36014 was investigated for its ready biodegradability in water (screening test) by different methods following:

OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)).

OECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test)

EU Method C.6

In the light of percentage degradation and COD data from all the above mentioned studies the test item FAT 36014 is considered as not biodegradable.

By the nature of their design and use, disperse 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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