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Phosphorus Movement in Soils: Soil-Orthophosphate Reaction Kinetics¹

ABSTRACT

This paper presents four models to describe the kinetics of P adsorption-desorption reactions in soils. The mass transfer model, Langmuir kinetics model, and Langmuir-Hinshelwood models were developed and compared with phosphate adsorption data on a soil obtained by batch-shaken flask experiments.

For P adsorption times up to 3 hours, the mass transfer and Langmuir kinetics models described the experimental data very well. The Langmuir kinetics model gave a slightly better fit of the experimental data. These kinetic data probably represent an upper bound for unsaturated flow in soils.

Key Words: P mathematical model • P adsorption-desorption • P kinetics • waste water renovation

¹ Contribution from the Department of Electrical Engineering and Systems Science, College of Engineering, and Department of Crop and Soil Sciences, College of Agriculture, Michigan State University, East Lansing, MI 48823. Financial support from NSFRANN through Grant GI-20 and from the Mich. StaLe Univ. Agr. Exp. Sta. is gratefully acknowledged.

² Former Assistant Professor in Electrical Engineering and Systems Science, and Crop and Soil Sciences, now Assistant Professor in Chemical Engineering at Cleveland State University, Cleveland, OH. Assistant Professor in Crop and Soil Sciences, Michigan State University, now Associate Professor, Savannah River Ecology Lab. Aikan, SC 29801.

Received for publication June 12, 1974.