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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable
Type of water:

Additional information

The aerobic biodegradation of the substance was evaluated according to the OECD 301F and EU Method C.4 -D. A measured volume of inoculated mineral medium, containing a known concentration of test item as the nominal sole source of organic carbon, is stirred in a closed flask at a constant temperature for 28 days. The consumption of oxygen is determined from the change in pressure in the apparatus. Evolved carbon dioxide is absorbed in soda lime. The amount of oxygen taken up by the microbial population during biodegradation of the test item (corrected for uptake by blank inoculum, run in parallel) is expressed as a percentage of Theoretical Oxygen De-mand (ThOD). A positive, abiotic and toxicity control run in parallel.

All validity criteria were met.

Degradation at the end of the test was 68.9 % and degradation at the end of 10-day-window 60.4 %

Therefore, when applying the 10-day-window, the substance is considered as readily biodegradable.