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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

FAT 45176/A was not readily biodegradable, and  was found to be slightly biodegradable (18 %) over the 28-day exposure period under the test conditions.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable, not fulfilling specific criteria

Additional information

The ready biodegradability of FAT 45176/A was determined in a 28 days MANOMETRIC RESPIROMETRY Test according to the OECD Guideline for Testing of Chemicals No 301F and used as the key study. The test substance and the reference substance were tested in a concentration of about 100 mg/l, corresponding to 97 mg ThOD/100 mg and 167 mg ThOD/100 mg, respectively. The mean value of the biodegradation of FAT 45176/A corrected by the blank control and measured as BOD versus ThOD was 0 % after 28 days. On the basis of the present study FAT 45176/A was not readily biodegradable.

Biodegradation test of FAT 45'176/A by microorganisms was performed under GLP compliance and used as a supportive study. Main component in the test substance changed to components contained in the test substance, but the test substance was not biodegraded by microorganisms under the present test conditions.

The BOD5 of the test substance FAT 45176/A was 14 mg O2/g. The COD of the test substance FAT 45176/A was 869 mg O2/g. The ratio of BOD5/COD is 1.6 %, which means the test substance is not readily biodegradable.

From the results above, it can be concluded that FAT 45176/A was not readily biodegradable.

FAT 45'176/A was investigated for its inherent biodegradability in the 28-Day "Zahn-Wellens/ EMPA Test". The mean concentration of DOC (Dissolved Organic Carbon) in the test flasks containing the test article slightly decreased from initially 76.3 mg/l to 62.7 mg/l over the exposure period of 28 days. Expressed as percentage DOC removal, a mean biodegradation of 18 % was noted by the end of the test (day-28). Therefore, FAT 45'176/A was found to be slightly biodegradable over the 28-day exposure period under the present test conditions.