The current regulatory requirements for environmental fate include aqueous photolysis and aerobic aquatic studies to evaluate degradation of agrochemicals in aquatic systems.  For some test compounds, these studies can result in very different degradation rates, usually a short photolytic half-life in the irradiated water study and a long half-life in the dark water/sediment study.  The current EU 2009/1107 guidance allows for the submission of irradiated water/sediment studies to address the issue of a long water/sediment half-life.  As this study type is relatively new, no definitive study design has been written in guidance documents.  This poster will describe one possible design of an irradiated water/sediment study as well as explore how multiple degradation processes, including photolysis, hydrolysis, microbial degradation, and adsorption, interact within controlled test systems/environments.  Understanding how these processes interconnect allows for prediction of how a compound will behave in an aquatic environment to support the environmental safety assessment.

Predicting environmental fate of agrochemicals in irradiated water-sediment systems

256th National Meeting (2018)

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