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Cesium Sorption to Illite as Affected by Oxalate

Published online by Cambridge University Press:  01 January 2024

Laura A. Wendling ,
James B. Harsh ,
Carl D. Palmer ,
Melinda A. Hamilton  and
Markus Flury
Laura A. Wendling*
Affiliation:
Department of Crop and Soil Sciences and Center for Multiphase Environmental Research, P.O. Box 646420, Washington State University, Pullman, WA 99164-6420, USA
James B. Harsh
Affiliation:
Department of Crop and Soil Sciences and Center for Multiphase Environmental Research, P.O. Box 646420, Washington State University, Pullman, WA 99164-6420, USA
Carl D. Palmer
Affiliation:
Idaho National Engineering and Environmental Laboratory, P.O. Box 1625, Idaho Falls, ID 83415, USA
Melinda A. Hamilton
Affiliation:
Idaho National Engineering and Environmental Laboratory, P.O. Box 1625, Idaho Falls, ID 83415, USA
Markus Flury
Affiliation:
Department of Crop and Soil Sciences and Center for Multiphase Environmental Research, P.O. Box 646420, Washington State University, Pullman, WA 99164-6420, USA
*
*E-mail address of corresponding author: lawendling@wsu.edu
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Abstract

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Cesium uptake by plants depends on adsorption/desorption reactions in the soil, as well as root uptake processes controlled by the plant. In this study, sorption and desorption of Cs+ on reference illite (IMt-1) was investigated in the presence of oxalate to gain understanding of mechanisms by which plant root exudates may influence Cs+ bioavailability in micaceous soils. Cesium sorption on illite decreased significantly as oxalate concentration increased from 0.4 to 2 mM. Cesium desorption from illite increased significantly with increasing oxalate concentration. Desorption of Cs+ by exchange with Na+, Ca2+ and Mg2+ was significantly enhanced in the presence of oxalate as selectivity for Cs+ decreased with respect to these ions in the presence of oxalate. On the other hand, oxalate had little effect on the Cs+/K+ selectivity coefficient. This suggests that oxalate treatments increase the relative proportion of exchange sites that are not highly selective for Cs+ and K+; e.g. ‘planar’ sites. The results indicate that oxalate plays an important role in Cs+ binding on illite and, therefore, plant rhizosphere chemistry is likely to alter Cs+ bioavailability in micaceous soils.

Keywords

Frayed-edge SitesPhytoremediationRhizosphereWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 3 , June 2004 , pp. 375 - 381
Copyright
Copyright © 2004, The Clay Minerals Society

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