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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

From the degradability results determined over a period of 28 days based on the BOD (average 1% degradation) and the residual concentration of the test substance (average 1 % degradation), it is concluded that the test substance is not readily biodegradable. No transformation product was generated under the conditions of this test.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

This endpoint was covered by read-across of a study of 1,4-bis[(2-ethyl-6-methylphenyl)amino]anthraquinone. This read-across is justified as both substances have very similar chemical structures, the main physicochemical parameters (vapour pressure, water solubility and dissociation constant) are in the same range and further all available toxicological studies for both substances revealed the same results. Therefore a read-across for other physicochemical, ecotoxicological or toxicological endpoints seems to be justified. More details about the read-across justification are displayed in a detailed document attached to the Annex of the CSR.