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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Ready Biodegradability (CO2 Evolution Test, OECD Guideline 301 B): not readily biodegradable but inherently biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

The test substance was not readily biodegradable. The biodegradation was 54 % within 28 days and 31 % within the 10d window.

The test substance is assumed to be inherently biodegradable, as it just missed the threshold of 60 % degradation within 28 days. The ECHA Guidance on Data Requirement and CSA, Part 7b says: "When results of ready biodegradability tests indicate that the pass level criterion is almost fulfilled (i.e. ThOD or DOC slightly below 60% or 70% respectively) such results can be used to prove inherent biodegradability."