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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The test substance was readily biodegradable in two reliable studies (Key Study: BMG, 2010).

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

In the reliable key study (BMG, 2010), the biodegradability of the test substance exposed to microorganisms derived from the activated sludge of a municipal sewage treatment plant was investigated under aerobic static exposure conditions.

The biodegradability - based on CO2evolution - of the test substance was calculated to be 86% of the theoretical value (ThCO2) after an incubation time of 28 days. The biodegradation of the test substance reached 66% at the end of the 10-d window.

Significant biodegradation of the test substance was observed after a lag phase of about 7 days.

The positive control, sodium benzoate, reached 100% biodegradation after 14 days, thus confirming suitability of inoculum and test conditions.

The test substance reached the pass level of 60% for ready biodegradability in the CO2Evolution Test (OECD 301B) within the 10-d window and, therefore, can be termed as readily biodegradable.

This result is supported by another reliable study (Mr. Schwarz, 2004).