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Environmental fate & pathways

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C12 -18 AO was readily biodegradable in studies performed to ISO 14593 and OECD TG 301 D. Similar results were obtained for C12 -14 AO in a number of studies performed to OECD TG 301 B or D. In a continuous activated sludge (CAS) test performed using C12 -14 AO, removal of parent amine oxide was > 99.8 % in both units. In a monitoring study, the influent and effluent concentrations of C12 and C14 amine oxide was measured in six municipal sewage treatment plants. The BOD removal was 96-98 %. On the basis of these studies, a removal rate in STP of 98 % is proposed for modelling. In a river water die away study performed using C12 -14 AO the half life of amine oxide was determined to be 3.2 days. In a biodegradation test performed using anaerobic digester sludge the rate constant for mineralization of C12 -14 AO was 1.32/day. These results of these studies are read across to C12 -18 AO.

Based on these studies, performed under both aerobic and anaerobic conditions, it is expected that amine oxides, including C12 -18 AO will be rapidly degraded in the environment, both in the aquatic environment and in soil and sediment.