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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

The ready biodegradability of the test item was assessed over a 28 day period by the modified Sturm test (OECD 301B). The nominal test concentrations were 10 and 20 mg a.s./L. The test material attained up to 11 and 7 % biodegradation after 28 days whereas the positive control substance (Aniline) was 94.4 % degraded 28 days. These results indicate that the test item cannot be classified readily biodegradable under conditions of the test.
The inherent biodegradability of the test item was assessed over a 28 day period by the modified Zahn-Wellens Test (OECD 302B). The nominal test concentrations was 10 mg a.s./L. The test material attained up to 60 % biodegradation after 28 days whereas the positive control substance was 100 % degraded after 27 hours. These results indicate that the test substance is inherently biodegradable in this test when measured by specific analysis.