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Selective Adsorption of Magnesium Ions by Vermiculite¹

Department of Soils and Plant Nutrition, University of California, Riverside, Calif.

ABSTRACT

Contrary to the usual generalization that the Ca ion is preferred over the Mg ion in ion exchange sorption by soils and clay minerals, Mg ions were found to be preferred markedly over Ca ions in exchange sorption by vermiculite when the percentage Mg-saturation exceeded about 30 to 40. This behavior might be expected from consideration of the common occurrence of Mg-vermiculites in comparison with the commonly wide Ca:Mg ratios of the natural leaching waters which are responsible for the conversion of biotite to vermiculite.

¹ Contribution from the Department of Soils and Plant Nutrition, University of California, Riverside. Appreciation is expressed to the National Science Foundation, which supported this work through research grant NSF-GP-323.

Received for publication December 11, 1964. Accepted for publication January 11, 1965.