HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Rao, T. S. Articles by Coleman, N. T. Search for Related Content PubMed Articles by Rao, T. S. Articles by Coleman, N. T. Agricola Articles by Rao, T. S. Articles by Coleman, N. T.

The Influence of Ionic Strength and Ion-Pair Formation Between Alkaline-Earth Metals and Sulfate on Na-Divalent Cation-Exchange Equilibria¹

ABSTRACT

The Na-Ca and Na-Mg ion-exchange equilibria were studied in two soils and in an ion-exchange resin by batch equilibration procedures. The apparent equilibria, in terms of concentrations, were different for the anions chloride or sulfate. The differences were reduced but not eliminated by ion activity corrections based on ionic strength. A more satisfactory agreement between the results in chloride and sulfate systems was obtained when allowance was made for solution phase activities and ion-association of Ca and Mg with SO₄ ions.

¹ Contribution of the Department of Soils and Plant Nutrition, University of California, Riverside. Financial support of the Rockefeller Foundation for the senior author is gratefully acknowledged.

² Graduate Student (presently Professor of Chemistry and Soils, College of Agriculture, Bangalore-24, India), Associate Professor, and Professor of Soil Science, respectively.

Received for publication October 9, 1967. Accepted for publication April 23, 1968.