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Predicting Boron Adsorption Isotherms by Midwestern Soils using the Constant Capacitance Model

^a USDA-ARS, George E. Brown, Jr. Salinity Laboratory, 450 W. Big Springs Road, Riverside, CA 92507
^b Dep. of Plant & Soil Sciences, Oklahoma State University, Stillwater, OK 74078

View larger version (32K): [in a new window]   Fig. 1. Prediction of B adsorption with the constant capacitance model: (a) Dennis soil; (b) Mansic soil; (c) Osage soil; (d) Pond Creek soil; (e) Pratt soil; (f) Summit soil. Experimental data are represented by circles (A horizon) and squares (B horizon). Model predictions are represented by solid lines (A horizon) and dashed lines (B horizon).

View larger version (23K): [in a new window]   Fig. 2. Comparison of the chemical constant capacitance model fit with one adjustable parameter (logKB– = –8.061, = 0.0077) to empirical Langmuir (R2 = 0.975**) and Freundlich (R2 = 0.985**) fits with two adjustable parameters.