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Thermodynamics of Sodium-Copper Exchange on Wyoming Bentonite at 298°K¹

ABSTRACT

The exchange of copper (Cu²⁺) for sodium (Na⁺) at 298°K on Wyoming bentonite was investigated in a perchlorate background medium maintained at pH 5.0 to 6.0 and at a total normality of 0.01N. It was found that the exchange process could be well characterized by a Vanselow selectivity coefficient that was equal to 1.32, independent of the exchanger composition, and by a similarly constant apparent adsorbed metal charge equal to 0.92 ± 0.05 eq kg^–1. These results are in conflict with previous data obtained at 295°K for Na⁺-Cu²⁺ exchange on montmorillonite in a 0.01N chloride background medium. It was concluded that a principal cause for the differences between the two sets of data could be the presence of CuCl⁺ complexes in the chloride medium.

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

² Professor of Soil Science, Research Associate IV, Graduate Research Assistant, and Research Associate II, respectively.

Received for publication March 11, 1981. Accepted for publication July 13, 1981.

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