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A Chemical Model of Phosphate Adsorption by Soils: I. Reference Oxide Minerals¹

ABSTRACT

The Constant Capacitance model is shown to provide a quantitative description of o-phosphate adsorption by a variety of aluminum and iron hydrous oxides, including the effect of varying pH values. This model, based on a ligand exchange mechanism for o-phosphate adsorption, comprises six adjustable parameters: two surface protonation-dissociation constants, three o-phosphate surface complexation constants, and a capacitance density parameter. The five surface equilibrium constants can be obtained from potentiometric titration data and o-phosphate adsorption data. These constants are independent of pH but, in principle, can depend on the composition of the background electrolyte solution. The capacitance density parameter cannot be obtained directly from experiment. A working value can be chosen on the basis of previous applications of the Constant Capacitance model and other model parameters are not sensitive to this choice.

¹ Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521.

² Former Graduate Research Assistant and Professor of Soil Science, respectively. The senior author is presently Soil Scientist, U.S. Salinity Lab., 4500 Glenwood Drive, Riverside, CA 92501.

Received for publication October 25, 1983. Accepted for publication March 14, 1984.

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