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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

A test on ready biodegradability showed that 50 % of the substance is degraded within 28 days. These results show that the substance is not readily biodegradable, but additionally provided evidence from an inherent test show that the substance can be degraded in sewage treatment plants. The substance is not readily biodegradable but inherent biodegradable (Bayer AG, 1994; Currenta, 2009). 

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable, fulfilling specific criteria

Additional information

The ready biodegradability of the substance was determined according to the EU method C.4 -D (Determination of the "Ready" Biodegradability - Manometric Respirometry Test) with the following result (Bayer AG, 1994): 50 % degradation after 28 days.

The inherent biodegradability was determined according to the OECD Guideline 302 C (Inherent Biodegradability: Modified MITI Test (II)) and results in 73 % degradation within 28 days (Currenta, 2009).

Based on these results, the substance is considered to be "Not Readily Biodegradable", but "Inherently Biodegradable" .