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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Not readily biodegradable: 7.6% (CO2 evolution) in 28 days

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The biodegradability of Fatty acids, C16-18 and C18-unsatd., hexaesters with dipentaerythritol (CAS 68604-38-6) was tested in a GLP guideline study following the specifications given by OECD guideline 301 B (Caduff, 2012). The study was conducted under aerobic conditions using domestic activated sludge as inoculum. During the incubation time of 28 days the degradation was followed by determining the CO2 production. A degradation rate of 7.6% was determined at test termination. Thus, a significant biodegradation of the substance was not determined under the test conditions. However, inhibitory effects of the test substance on activated sludge organisms were not observed in the toxicity control of the study. The substance is therefore considered as not readily biodegradable and in accordance with Regulation (EC) No. 1907/2006, it is regarded as very persistent (v P).