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Environmental fate & pathways

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In view of the low water solublity, screening tests have not been attempted, but instead higher level testing has been performed in accordance with requirements for plant protection products.

According to the water/sediment simulation study, triflumuron could be regarded as a rapidly dissipating compound from the water phase of a water/sediment system. Considering the total water/sediment system (i.e. an aquatic environment) triflumuron is quickly and thoroughly degraded as well as mineralised to CO2. Major metabolites identified in the water phase are 2-chlorobenzoic acid (concentrations 44.8% and: 60.4% of the applied radioactivity in 14 days) and 4-trifluoromethoxyphenyl urea (concentrations 24.6% and 47.8% of the applied radioactivity at day 14). Major metabolites identified in sediments are 2-chlorobenzoic acid (concentrations less than 8%) and 4-trifluoromethoxyphenyl urea (peak concentrations 20.4% and 14.1% at days 7 and 14).

The test item Triflumuron was found to degrade rapidly in a typical soil environment under aerobic laboratory conditions. The decline occurred with calculated DT50 values of 1.7 to 7.3  days (at 20°C) in the three soils tested (this is equivalent to 3.61 to 15.5 days at 12°C). Due to its short half-life, Triflumuron is unlikely to accumulate in viable soils. The present study demonstrated Triflumuron to be rapidly degraded in typical agricultural soils under aerobic laboratory conditions. Therefore, the compound will not persist in a viable soil environment.

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