Modeling Sorption Behavior of Atrazine on Intact Soil Columns
Publication: Journal of Irrigation and Drainage Engineering
Volume 125, Issue 4
Abstract
The sorption behavior of atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine), a commonly used herbicide for corn, on intact soil columns was studied by incorporating a new two-stage sorption mechanism into PESTFADE, a pesticide fate and transport model. This mechanism takes into account intraparticle diffusion of pesticide into the soil matrix (also sometimes known as bound residues), the sorption capacity of soil, and a variable pesticide distribution coefficient Kd. The modified model's performance was verified by comparing simulated values with those obtained from an intact column study in the laboratory. The two-stage mechanism was also compared and contrasted with the conventional adsorption approach based on a constant Kd. Simulations with the two-stage mechanism indicated a closer agreement with measured values (deviations in the range of 5–65%) than that of the conventional adsorption approach (deviations in the range of 10–700%). Furthermore, it was found that simulated values were particularly sensitive to soil tortuosity τ, soil bulk density ρ, soil moisture content θw, labile sorption capacity θc, and intraparticle diffusion parameters.
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Information & Authors
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Published In
Journal of Irrigation and Drainage Engineering
Volume 125 • Issue 4 • July 1999
Pages: 212 - 222
History
Received: Apr 8, 1997
Published online: Jul 1, 1999
Published in print: Jul 1999
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