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| - Determining Kinetic and Nonequilibrium Sorption Behavior forChlopyrifos Using a Hybrid Batch/Column Experiment
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| - Pesticide mobility in soil is strongly coupled to the chemical's sorption characteristics. A modified soilcolumn batch experiment was conducted to measure the transient nature of chlorpyrifos sorptionand desorption from Cecil soil. This experimental system minimizes many shortcomings associatedwith obtaining sorption parameters by fitting soil column data to an advective−dispersive transportequation. Several chlorpyrifos formulations were investigated to determine how formulations affectsoil sorption, and if this effect is adequately described using transient sorption/desorption algorithms.Both a second-order sorption with first-order desorption kinetic model and the two-site kinetic/equilibrium model were found to yield reasonable comparisons to experimental observations. Ingeneral, the formulation temporarily decreases the sorptivity of chlorpyrifos and alters the time forequilibrium to be achieved. Care must be exercised when extrapolating sorption data for a puremolecule in a laboratory setting to formulated materials used in field applications when environmentalfate predictions are sought. Keywords: chlorpyrifos; sorption; kinetics; nonequilibrium
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