Abstract
AbstractA recent, corrected thermodynamic equation for the Gapon cation exchange selectivity coefficient produces a relation between the exchangeable sodium ratio (ESR) and the sodium adsorption ratio (SAR) that is indistinguishable from the widely used, empirical ESR‐SAR relation when SAR ≤ 40. In this sense, the thermodynamic theory of cation exchange is consistent with the empirical ESR‐SAR relation over the range of SAR values that has practical importance in the management of sodium‐affected soils.
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