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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

MON 13900 in 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 MON 13900 according to the EU Method C.4-D and OECD Guideline 301 F in compliance with GLP. An automated closed-system oxygen consumption measuring apparatus (Sapromat) was used. The test substance was added to two replicates of test medium solution at a concentration of 21.3 mg in 250 mL. The medium solution was inoculated with activated sludge (pH 7.7) to give 27 mg suspended solids/L. Comparisons were made to untreated inoculated medium and inoculated medium treated with sodium benzoate at 100.0 mg/L. The mixtures were maintained at 20°C for 28 d and the oxygen consumed and carbon dioxide evolved continuously measured. Theoretical oxygen demand was calculated.Under the test conditions, the % biodegradation for two replicates was 0 and 1.5. Hence, the test substance could not be classified as readily biodegradable.