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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 Guidelines for Testing of Chemicals (1992) No 301B, "Ready Biodegradability; CO2 Evolution Test" referenced as Method C.4-C of Commission Directive 92/69/EEC (which constitutes Annex V of Council Directive 67/548/EEC), and US EPA Fate, Transport, and Transformation Test Guidelines OPPTS 835.3110 Paragraph (m).

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, whereby 60 % degradation must be attained within 10 days of the degradation exceeding 10 %. The test material can, therefore, be considered as readily biodegradable under the strict terms and conditions of OECD Guideline No 301B.