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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The biodegradability of the substance was determined in a screening study in accordance with OECD TG 301D (closed bottle test). In this study the observed biodegradation percentages did not exceed 1%. Based on these findings the substance is characterised as not readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The biodegradability of the substance was determined in a screening study in accordance with OECD TG 301D (closed bottle test) and in compliance with GLP criteria (Kurume Laboratory, 2009). In this study secondary effluent of city sewage treatment plant was exposed to test substance as follows: (1) Test solution (water + test item) (n=2); (2) Test solution (inoculum + test item (n=12); (3) Test solution (inoculum + sodium benzoate) (n=10) and (4) Test solution (control blank) (n=11). The test substance concentration was 6.48 mg/L. Test flasks were allowed to stand for 28 days at room temperature in the absence of light. After the 28 day exposure period, the cumulative percentages biodegradation were calculated from both the oxygen depletion (BOD/ThOD ratio) and from the decrease of test item concentrations. The observed biodegradation percentages did not exceed 1% in either of the two test methods. Based on these findings the substance is characterised as not readily biodegradable.