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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Biodegradation: 74% (28-days; 10-d window met) readily biodegradable, OECD301F, Givaudan Suisse SA 2014

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

The ready biodegradability test was carried out according to OECD 301F, EU C.4 -D and EPA OPPTS 835.3110 guidelines under GLP. The test substance was added to an aqueous solution of mineral salts and exposed to relatively low numbers of micro-organisms under aerobic conditions for a period of 35 days. Activated sludge was obtained from the biological waste water treatment plant (Bois-de-Bay, Satigny, Switzerland - treating predominantly domestic sewage) and the inoculum added to give a final concentration of 30 mg dry material per test flask. The consumption of oxygen is determined by measuring the pressure drop in the respirometer flask (the respirometer used during this study is an Oxitop Control System). The dissolved oxygen concentrations were recorded at least once per day. The average biodegradation for duplicate test flasks at 28 days for the test substance was 74%. This test material satisfied the test criteria for ready degradability of 60% degradability within 28 days. The 10-day window criterion was also fulfilled (20% biodegradation on day 2 and 63% on day 12).