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Solution and Adsorbed Fluometuron Concentration Distribution in a Water-Saturated Soil: Experimental and Predicted Evaluation¹

ABSTRACT

A technique is described for measuring the solution and adsorbed phases of fluometeron in water-saturated soil columns. The data reveal that at an average pore-water velocity of 5.5 cm/hour, the solution and adsorbed phases of fluometuron are not in equilibrium, whereas, at the 0.59 cm/hour velocity they were in equilibrium. The kinetic rate equations for adsorption and desorption were not significantly better than the equilibrium model when describing the fast displacement of fluometuron through soils. The desorption distribution coefficient (k_A'/k_D') was found to be a function of the maximum amount of herbicide adsorbed prior to desorption. The experimental data were reasonably well described by the mathematical model.

¹ Contribution from the Dep. of Agronomy, Oklahoma State Univ., Stillwater, Oklahoma Agr. Exp. Sta. Journal Manuscript no. 2624. This study was partially supported by EPA. Research Grant No R-800364 and project H-1366.

² Soil Scientist, Environmental Protection Agency, P. O. Box 1198, Ada, Oklahoma, formerly NSF Trainee, Oklahoma State Univ., Stillwater and Associate Professor of Agronomy, Oklahoma State Univ., Stillwater, respectively. The authors thank Daniel R. Baker for his assistance in writing the computer programs used in this manuscript.

Received for publication April 27, 1973. Accepted for publication August 28, 1973.