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This article in SSSAJ

  1. Vol. 41 No. 4, p. 718-721
     
    Received: Sept 17, 1976
    Accepted: Mar 23, 1977


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doi:10.2136/sssaj1977.03615995004100040020x

Influence of Exchangeable Cation on the Sorption of Trace Amounts of Cadmium by Montmorillonite1

  1. J. García-Miragaya and
  2. A. L. Page2

Abstract

Abstract

The effect of different exchangeable cations on the sorption of trace amounts of Cd by montmorillonite (clay fraction, Upton, Wyoming) was studied by equilibrating samples of homoionic clay suspensions with CdCl2 solutions ranging from 15 to 120 µg Cd/liter. These Cd concentrations are similar to those found in natural and contaminated soil-water systems. The amount of Cd sorbed on the montmorillonite surfaces depended on the kind of exchangeable cation, decreasing in the order Na-montmorillonite > K-montmorillonite > Ca-montmorillonite > Al-montmorillonite. Exchangeable Al was found to be particularly effective in reducing Cd sorption by high energy sites on montmorillonite.

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