The Separation Factor Applied to Some Soil Ion Exchange Equilibria

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Abstract
A variety of exchange equations are available to investigators, who may select the one that best fits their purposes or experimental data. Although equations based upon the separation factor (which does not contain ionic valences as exponents) have not been frequently used in ion exchange equilibria in soils, this investigation indicates that the approach may deserve more attention. Some monovalent‐divalent ion exchange equilibria with montmorillonite are closely predicted by the separation factor. Further, variations in the separation factor with soil mineralogy and total solution concentration appear to be small enough to permit useful prediction of the ratio of exchangeable Na+ and Ca2+ in the soil from the ratio of Na+ to Ca2+ in the saturation extract.

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