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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Not readily biodegradable (according to OECD criteria).

Key value for chemical safety assessment

Additional information

Data on the ready biodegradability of the described pigment are not available. However, one model calculation was conducted to assess the biodegradability. The biodegradation was calculated by using CATALOGIC v5.11.5 (BOD 28 days MITI (OECD 301C) v06.07). It resulted in ca. 5.46 % biodegradation after 28 d. Even though the structural domain was correct with only 27.78 % (72.22 % unknown) the results support the conclusion that the pigment is not readily biodegradable (according to OECD criteria).

Moreover, the 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. For this reason no ready or inherent degradation studies are proposed.