Sorption of flutriafol in the soil is time-dependent, with increasing apparent adsorption with time. This time-dependent sorption kinetics can lead to estimated environmental concentrations (EECs) that are significantly different from those predicted with equilibrium adsorption models. In this study, LEACHP, PRZM-GW, and RZWQM2 models were applied to six leaching-vulnerable locations representing different geographic conditions for predicting flutriafol concentrations in ground water. LEACHP and PRZM-GW models were parameterized assuming instantaneous equilibrium sorption, while RZWQM2 was parameterized with instantaneous equilibrium sorption as well as kinetics sorption. The predicted EECs in ground water by the three models were compared to evaluate the influence of sorption processes on EECs. These predictions were also compared with data collected from ground water monitoring studies. In addition, the potential impacts of the sorption processes on flutriafol risk assessment are also discussed.

Influence of time-dependent sorption of flutriafol on predicted environmental concentrations

246th National Meeting (2013)

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