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Environmental fate & pathways

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The described 'yellow disazo condensation pigment' is practically insoluble and therefore considered to be essentially not bioavailable. Due to the large molecular size, cellular uptake of the pigment is unlikely. Hence intracellular biodegradation, which is the main degradation route of bacteria, is probably low. It can be concluded that the substance is likely to persist in the environment. This confirms an inherent biodegradation test (CAS 5280-80-8) according to OECD guideline 302C, in which only 12% degradation were observed after 28 days. Additionally, two model calculations showed that the pigment is not readily biodegradable. Therefore, biodegradation simulation tests in water, sediment or soil are not proposed, since no relevant new findings are expected from such investigations.