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Environmental fate & pathways

Biodegradation in soil

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According to REACH regulation (Annex IX, 9.2.1.3, column II), the study on biodegradation in soil does not need to be done if the substance is readily biodegradable.

The extent of mineralization and the resulting half-life was calculated for 14C-MDEA-Esterquat C16-18 and C18 unsatd.  and its hydrolysis product X0401 in sludge amended soils collected from Amelia/Batavia Sewage treatment plant. Volumes of three different sludge amended soils were incubated at desired temperatures with specific amounts of radiolabelled test control substances to determine the biodegradability of the substances. The experiments were conducted at different time periods using a range of test concentrations (0.1 -10 ppm). The % of 14CO2 production of MDEA-Esterquat C16-18 and C18 unsatd. ranged from 21 -48% over >100 days. This corresponded to a measured half-life of 11-39 days in sludge amended soil. The half life of the hydrolysis product ranged from 7 -28 days. The study is not assignable due to missing details of the study design. However it can be regarded as a supportive study.

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