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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Ready biodegradability of Modified Small Vinyl Ester was assessed conducting a modified sturm test (according to OECD Guideline 301B) compliant with GLP. Modified Small Vinyl Ester did not inhibit microbial activity in the toxicity control. The relative biodegradation values calculated from the measurements performed during the test period revealed no significant biodegradation of Modified Small Vinyl Ester. Modified Small Vinyl Ester was evaluated to be not readily biodegradable under the conditions of the test. This may be due to low bioavailability

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

Ready biodegradability of Modified Small Vinyl Ester was assessed with a modified sturm test (according to OECD Guideline 301B) compliant with GLP.

The study consisted of six bottles:

2 inoculum blanks (no test substance)

2 test bottles (Modified Small Vinyl Ester)

1 positive control (sodium acetate) and

1 toxicity control (Modified Small Vinyl Ester plus sodium acetate)

Modified Small Vinyl Ester was weighed on a thin glass slide and thereafter added to the 2-litres test bottles containing medium with microbial organisms and mineral components. It was ensured that the glass slides were not upside down in the test bottles. The test solutions were continuously stirred during the test, to ensure optimal contact between the test substance and the test organisms. Test duration was 28 days (last CO2-measurement on the 29th day).

The relative biodegradation values calculated from the measurements performed during the test period revealed no significant biodegradation of Modified Small Vinyl Ester. In the toxicity control, Modified Small Vinyl Ester was found not to inhibit microbial activity. Since all criteria for acceptability of the test were met, this study was considered to be valid. In conclusion, Modified Small Vinyl Ester was evaluated as not readily biodegradable. However, this result may be due to the low bioavailability.