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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

poorly biodegradable

Key value for chemical safety assessment

Additional information

The pigment is not expected to biodegrade and this assumption is supported by several studies.

(1) In a test on the structural analogue (CAS 7023 -61 -2) following OECD guideline 301B the ready biodegradability of the substance was tested. Based on the CO2 evolution a degradation rate of 0 % was determined after 28 days inoculation time (BASF SE, 2007).

(2) In a test on an analogue (CAS 5281 -04 -9) following OECD guideline 301C the substance was inoculated with a mixture of sewage, soil and natural water and the O2 consumption during 28 days inoculation time was recorded. Overall the substance was degraded by 9 -12 % after 28 days (JETOC, 1992).

(3) The third study (on CAS 73612 -29 -0) was conducted according to OECD 301C with a mixture of sewage, soil and natural water as inoculum. The degradation rate after 28 days was 0 % based on O2 consumption of the inoculum (Dainippon Ink and Chemicals Inc., 2006).

(4) The fourth test on CAS 5160 -02 -1 revealed a degradation of 0% based on oxygen consumption.

In conclusion, the present substance is regarded to be not biodegradable and thus persistent in the environment.

For the detailed read across justification please refer to the annex attached to the CSR.