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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

According to a reliable OECD guidelines study, , C16-C18 and C18-unsatd., TMAC was readily biodegradable. Therefore based on the adopted read-across aproach, C16-C18 TMAC is also expected to be readily biodegradable. 

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

A guideline study was performed to assess the ready biodegradability of the read-across substance C16 -C18 and C18-unsatd., TMAC

The test substance at 2 mg/L was incubated with inoculums from river water and O2 consumption was followed over a period of 28 days.71% O2 consumption was obtained for the test substance at 2 mg/L by the end of the 28 days, but failing 10-day window. This was attributed to the additional time required to degrade the other component, isopropanol present in the test sample. Hence, the authors suggested ignoring the time-window criterion to consider the test substance as readily biodegradable.Furthermore, the study was considered to be valid as shown by an endogenous respiration of 1.0 mg/L, total mineralization of the reference compound, sodium acetate (i.e., 76% degradation after 14 days) and oxygen concentrations >0.5 mg/L in all bottles during the study.Under the test conditions, the test substance is considered to be readily biodegradable (van Ginkel CG, 2010).