The Gapon Coefficient and the Exchangeable Sodium Percentage-Sodium Adsorption Ratio Relation1
- J. D. Oster and
- Garrison Sposito2
A 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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