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Environmental fate & pathways

Endpoint summary

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Additional information

All endpoints in this chapter were covered by read-across of studies 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.


In accordance with REACH Annex VIII column 2, the study does not need to be conducted if the substance is readily biodegradable or highly insoluble in water.

Biodegradation in water:

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.

Biodegradation in water, sediment and soil:

According to the REACh Annex XI, Section 1, the performance of simulation tests covering the aquatic,sediment and soil compartment is scientifically not necessary as it would not provide additional information for the hazard, risk and persistency assessment. As the substance neither fulfills the B, nor the T criterion, no further information is required for the PBT assessment (Guidance Document R.7b, ECHA, 2008; p198).


The concentration of the test substance in fish ranged from 0.37 to 1.08 µg/g (w/w) and the bioconcentration (BCF) was 2 to 5. On the basis of the BCF obtained, it is concluded that the bioaccumulation potential of the test substance in fish is low under the test condition.


An adsorption coefficient (log Koc) of 6.2 was determined at pH 6, which refers to 25 °C.