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Environmental fate & pathways

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Administrative data

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A closed bottle ready biodegradation study was performed to assess the ready biodegradability of the read across substance, amides, C16-18, N-(hydroxyethyl), with non-adapted municipal activated sludge according to OECD Guideline 301 D, in compliance with GLP. The test substance concentration was 3.33 mg/L, corresponding to 10.22 mg O2/L in the test vessel. Degradation was analysed by measuring the oxygen concentrations over a period of 28 d. Biodegradation was expressed as the percentage BOD and calculated for each oxygen analysis. Sodium acetate was used as the reference control at 10 mg/L. The test substance reached the 10% level (begin of degradation) after 2 d. The pass level of >60% was reached after 17 d. The degradation reached a maximum of 69% after 28 d. The biodegradation for the reference substance reached 68% after 14 d. All the validity criteria according to the guideline were fulfilled. Under the test conditions, the test substance was considered readily biodegradable (Fiebig, 2005).