Sorption, Desorption, and Isotope Exchange of Cesium (10−9–10−3 M) on Chlorite

A. Grütter, H. R. von Gunten1 and E. Rössler
Eidgenössisches Institut für Reaktorforschung CH-5303 Würenlingen, Switzerland
1 Also affiliated with Laboratorium für Radiochemie, Universität Bern, CH-3000 Bern 9, Switzerland.

Abstract: Batch cation-exchange experiments were performed on chlorite, using synthetic ground water containing cesium in the concentration range 10−9–10−3 M. The sorption behavior was complex; with increasing Cs concentration, the distribution ratio of Cs decreased at first, but passed through a pronounced maximum at high Cs loadings. The desorption data differed from the sorption data only by a shift towards larger distribution ratios in the region of the maximum. The distribution ratios for isotope exchange were even larger, but varied less with Cs loadings. Similar results were obtained for KCl-treated chlorite; however, grinding or acid-treatment of the chlorite considerably altered its behavior, the absence of the maximum being the most striking change. Most of the effects at higher Cs loadings can be explained by postulating structural changes induced by the sorption of Cs.

Key Words: Acid treatment • Cation exchange • Cesium • Chlorite • Isotope exchange • Sorption

Clays and Clay Minerals; December 1986 v. 34; no. 6; p. 677-680; DOI: 10.1346/CCMN.1986.0340609
© 1986, The Clay Minerals Society
Clay Minerals Society (www.clays.org)