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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Not readily biodegradable: 21% degradation after 28 days (OECD TG 301B, EC Method C.4-C)
Not readily biodegradable: 15% degradation after 28 days and 18% degradation after 42 days (OECD TG 301B; EC Method C.4-C: enhanced following the modifications as set out in ECHA guidance R.7b)

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

In the first Klimisch 1 key study by Clarke, the test substance was tested in the CO2 evolution test. After 28 days, the observed biodegradation was 21%. The toxicity control and positive control were both valid. The test substance is regarded as not readily biodegradable.

In the second Klimisch 1 key study by Clarke, the test substance was tested in an enhanced CO2 evolution test, according to the modifications as set out in ECHA endpoint specific guidance R.7b. The test duration may be extended up to 60 days dependent on the level of biodegradation observed. The test volume employed was increased from 3 litres to 4 litres. The concentration of inoculum used was increased from 30 to 60 mg suspended solids/l. After 28 days, the observed biodegradation was 15%, and after 42 days, the observed biodegradation was 18%. The toxicity control and positive control were both valid. The test substance is regarded as not readily biodegradable.