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Inherent Biodegradation

The inherent biodegradability of the test item was determined in the Modified MITI Test (II) with non adapted activated sludge for a period of 28 days. The study was conducted according to OECD Guideline 302 C. The mean oxygen depletion in the inoculum control came to 19.7 mg O2/L after 28 days. In order to check the activity of the test system sodium acetate was used as functional control. The functional control reached the pass level of > 65 % after 4 days. It came to a biodegradation rate of 69 % after 28 days. The 10 % level (beginning of biodegradation) was reached only by one test item replicate on day 28. The mean biodegradation came to 3 % after 28 days. No elimination/abiotic degradation of the test item occured in the blank. The validity criteria of the guideline are fulfilled. Under our test conditions, the test item was not inherently biodegradable within 28 days.

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