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The Separation Factor Applied to Some Soil Ion Exchange Equilibria
Author(s) -
Kittrick J. A.
Publication year - 1976
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1976.03615995004000010039x
Subject(s) - ion exchange , saturation (graph theory) , montmorillonite , soil water , chemistry , divalent , cation exchange capacity , separation (statistics) , ionic bonding , ion , soil science , inorganic chemistry , mineralogy , geology , mathematics , statistics , organic chemistry , combinatorics
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 Ca 2+ in the soil from the ratio of Na + to Ca 2+ in the saturation extract.