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Hydration Status of Adsorbed Cations
Author(s) -
Shainberg I.,
Kemper W. D.
Publication year - 1966
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/sssaj1966.03615995003000060017x
Subject(s) - adsorption , ion , molecule , steric effects , chemistry , layer (electronics) , charge (physics) , chemical physics , computational chemistry , inorganic chemistry , physics , stereochemistry , organic chemistry , quantum mechanics
Energies with which cations adsorb water molecules are calulated and discussed. An amendment to the diffuse layer theory is developed which takes into consideration the hydration energy of the ions, position of the negative charge in the clay, and other steric factors. Calculations using this amended theory predict differences in the adsorption characteristics of Li + , Na, + and K + which appear to be in general agreement with experimental observations. Calculations for the interacting diffuse layer case indicate that the fraction of the adsorbed ions residing in the first molecular layer of water (Stern Layer) is essentially independent of distance between the platelets when this distance is greater than 2.5A. Pushing the platelets closer together results in a arger portion of the adsorbed ions in the Stern Layer. The various assumptions and estimates involved in the development of the theory and the calculations are discussed.