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DIVISION S-2-SOIL CHEMISTRY

Reanalysis of Boron Adsorption on Soils and Soil Minerals Using the Constant Capacitance Model

^a USDA-ARS, U.S. Salinity Lab., 450 W. Big Springs Rd., Riverside, CA 92507 USA

sgoldberg{at}ussl.ars.usda.gov

Inclusion of microscopic information improved the ability of the constant capacitance model to provide a quantitative description of B adsorption on various Al and Fe oxides, clay minerals, and arid-zone soils as a function of solution pH. The same set of B surface complexation reactions was used for all adsorbing surfaces. This study tests the ability of the model to describe B adsorption using surface configurations that had been observed experimentally. In the present model application, both trigonal, B(OH)₃, and tetrahedral, B^-₄, B surface complexes are postulated, consistent with experimental spectroscopic results. Boron surface complexation constants for Al and Fe oxides and kaolinites are not statistically significantly different from each other. Boron surface complexation constants for kaolinites are statistically significantly different from those for 2:1 clays and soils. Boron surface complexation constants for 2:1 clays and soils are not statistically significantly different from each other, reflecting the dominance of 2:1 clay minerals in B adsorption reactions in arid-zone soils. Average sets of B surface complexation constants provided adequate descriptions of B adsorption behavior on all adsorbents studied, indicating some predictive capability. The constant capacitance model was able to predict B adsorption behavior on additional arid-zone soils using the average set of B surface complexation constants.

Abbreviations: ATR-FTIR, Attenuated Total Reflectance Fourier Transform Infrared • SA, surface area • suspension SD, suspension density

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