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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

In a modified OECD screening test (EU Method C.4-B, OECD 301E) the test substance was degraded by 6 % after 28 days (measured as DOC removal) and is therefore considered as not readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

A study was performed to assess the ready biodegradability of test substance according to Directive 92/69/EEC, method C.4-B (modified OECD screening test) and the equivalent OECD guideline 301E, in compliance with GLP.

The test substance in a mineral medium was inoculated with secondary domestic effluent and incubated for 28 d under aerobic conditions. During this period the biodegradation was followed by percentage removal of DOC based on the initial concentration present.

The test substance showed 5, 3, 5 and 6 % degradation after 7, 14, 21, 28 d. Therefore, the test substance is classified as not readily biodegradable. The reference substance showed 99 % degradation after 14 d.

Under the employed test conditions, the test substance is considered not to be readily biodegradable.