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Environmental fate & pathways

Biodegradation in soil

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The behaviour of the substance has been extensively investigated in several studies. The objective of the studies was to determine the metabolic pathway, degradation rate and half-life of the substance under aerobic and anaerobic conditions in soil. For this purpose, the concentrations of the substance and its metabolites in soil, their rate of formation and degradation and their identity were determined with radioactive labelled test item under laboratory conditions. Additionally, volatile metabolites including 14CO2 and bound residues were quantified to establish material balances.

An aerobic soil environment will have a significant contribution to the overall degradation of the substance. The substance is oxidized to degradation products which were further mineralized to CO2. The half lives in aerobic soils (DT50) of the substance were between 0.1 – 1.13 days in the different soils (4 EU soils and 1US soil).

An additional anaerobic study investigates the biotic degradation under anaerobic conditions. This laboratory study showed that the test substance was rapidly degraded (DT50 = 0.02 d) under anaerobic conditions.