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Environmental fate & pathways

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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 and 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.

Furthermore, an available study on the substance in which the colour and DOC elimination was evaluated after 24 hours of incubation with activated sludge, concludes that the test substance is not sufficiently eliminated from water.

Based on the above considerations, the substance is expected to be non (readily) biodegradable and thus a test is not considered as necessary.

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