Cation Exchange Selectivity Coefficient Values on Smectite and Mixed‐Layer Illite/Smectite Minerals

Soil Science Society of America Journal - Tập 73 Số 3 - Trang 928-942 - 2009
Christophe Tournassat1, Hélène Gailhanou1, Catherine Crouzet1, Gilles Braibant1, Anne Gautier1, Éric C. Gaucher1
1Bureau de Recherches Géologiques et Minières (BRGM)

Tóm tắt

Sodium‐K, Na‐Ca, Na‐Mg, and Na‐Sr exchange isotherms were performed at a total Cl concentration of about 0.005 mol L−1 on the fine fraction (<2 μm) of MX80 montmorillonite, mixed‐layer illite smectite minerals (IS), and clayey stones from European underground research laboratories. The derived selectivity coefficients for Na‐K, Na‐Ca, Na‐Mg, and Na‐Sr were found to vary very significantly as a function of the exchanger composition. A model was built to reproduce the data, taking into account the change of selectivity coefficient as a function of the exchanger composition of smectite. Model parameters were fitted using data from the present study and data from the literature obtained on smectite minerals. The addition of parameters for cation–anion pairs was found to improve the fitting results. The model was then successfully tested to reproduce published cation‐exchange features on natural clayey materials and soils suspended in fresh or saline water. Finally, it is shown that the simple combination of this smectite exchange model with a previously published illite exchange model is quite successful although perfectible in reproducing exchange data on IS.

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Soil Science Society of America Journal

Tập 73 Số 3

928-942

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