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A Chemical Model of Phosphate Adsorption by Soils: II. Noncalcareous Soils¹

ABSTRACT

The Constant Capacitance model provided a quantitative description of o-phosphate adsorption by 44 noncalcareous soils whose pH values ranged from 4.9 to 7.6. The intrinsic surface protonation-dissociation constants, capacitance density, and phosphate packing area parameters required by the model were adopted from model calculations on reference hydrous oxide minerals. The intrinsic phosphate surface complexation constants were calculated through the application of a nonlinear least squares fitting program to the soil o-phosphate adsorption data. Two of these intrinsic constants were found to be independent of pH over the range investigated, as required by the model. However, the intrinsic constant for the formation of the neutral o-phosphate surface species exhibited a statistically significant dependence on pH. The Constant Capacitance model was best able to describe o-phosphate adsorption by noncalcareous soils, including pH effects, if a soil-specific set of intrinsic phosphate surface complexation constants was employed.

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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