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A Modified Miscible Displacement Technique for Investigating Adsorption-desorption Kinetics in Soils¹

ABSTRACT

The use of miscible displacement techniques to study kinetics of ion exchange in clay minerals and soils is increasing. Although only 1 g or less of adsorbent is often used, some of the adsorbate solution will always be retained by the adsorbent. The dilution of the incoming solution by the retained solution is easily mistaken for either adsorption or desorption, resulting in an overestimation of either process. A device that ensures constant dilution volumes, regardless of adsorbent, was developed to differentiate the adsorption-desorption process from the dilution process.

¹ Published with the approval of the Director of the Delaware Agric. Exp. Stn. as Misc. Pap. no. 1091. Contribution no. 175 of the Dep. of Plant Science, Univ. of Delaware, Newark, DE 19717-1303.

² Univ. Graduate Research Fellow and Associate Professor of Soil Chemistry, respectively.

Received for publication January 22, 1985. Accepted for publication April 22, 1985.

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