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Calcium-Magnesium Exchange on Wyoming Bentonite in the Presence of Adsorbed Sodium¹

ABSTRACT

The exchange of magnesium for calcium at 298 K on Wyoming bentonite was investigated in a 50 mol m^–3 perchlorate background maintained at pH 7. The charge fraction of Na⁺ in the aqueous solution phase was controlled at the values of 0.74 or 0.87 during the exchange experiments, resulting in average exchangeable sodium percentages (ESP) of either 16 or 36% on the clay. The Vanselow selectivity coefficient for Ca Mg exchange was equal to 1.0 and was independent of exchanger composition at both ESP values. This result implied that, under the conditions of the exchange experiments, the clay exhibited equal affinities for Ca²⁺ and Mg²⁺ regardless of the quantity of adsorbed sodium present.

¹ Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521.

² Professor of Soil Science, Visiting Postdoctoral Fellow, Research Associate IV, and Research Associate III, respectively.

Received for publication February 22, 1983. Accepted for publication June 21, 1983.

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