The EPA guideline for field volatility testing of a pesticide suggests flux estimates from three methods: Aerodynamic (AD), Integrated Horizontal Flux (IHF), and Indirect (ID). Both AD and IHF methods use the air concentration from the center of the field along with in-situ meteorological data (temperature and/or wind speed) to derive an estimate for flux. The ID method uses meteorological data and an atmospheric dispersion model (such as AERMOD) to back-calculate the flux necessary to produce an array of observed off-field concentrations. This talk will provide an overview of the three methods followed by comparative flux estimates from five field studies. These field studies were conducted in different locations, under variable environmental and field conditions. The alignment across the three methods supports EPA-recommended flux estimation approaches and further increases confidence in the use of air dispersion modeling to estimate off-target air concentrations.

Comparison of three flux models across five field studies

2019 Fall National Meeting

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