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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Based on the LSC analysis of total 14C activity in the effluent the mean elimination rate of the total influent concentration of N-Dodecanoyl[1-14C]glycine, sodium salt was calculated to be 97.77 % in a continuously operating activated sludge unit. 2.2% of 14C was found in the effluent but only 37% could be adsorbed in a reversed phase cartouche, 67% of 14C is most likely incorporated in biological material not sorbing to the cartouche. This means that only 37% of the 2.2% 14C in the effluent is as worst case related to the test substance itself (=0.8%) and thereforie the elimination in the sewage treatment plant is >99%. For exposure estimations 99% primary degradation in the sewage treatment plant is used.

The mineralization reached a mean value of 86.6 %; the mass balance was determined to be 91.7 % on average.

Key value for chemical safety assessment

Additional information