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Environmental fate & pathways

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Biodegradation in water:


A study was performed to assess the ready biodegradability of the test material in an aerobic aqueous medium. The test followed that described method in the OECD TG 301B, "Ready Biodegradability; CO2 Evolution Test" referenced as Method C.4-C of Commission Directive 92/69/EEC.


The test material, at a concentration of 10 mg Carbon/L, was exposed to activated sewage sludge micro-organisms with culture medium in sealed culture vessels in the dark at approximately 21 °C for 28 days. The degradation of the test material was assessed by the determination of carbon dioxide produced. Control solutions with inoculum and the standard material, sodium benzoate, together with a toxicity control were used for validation purposes. The test material attained 78 % degradation after 28 days and satisfied the 10-Day window validation criterion. The test material can, therefore, be considered as readily biodegradable under the test conditions.

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