Sorption of Strontium on Unconsolidated Glaciofluvial Deposits and Clay Minerals; Mutual Interference of Cesium, Strontium and Barium

Grütter, A.; von Gunten, H. R.; Rössler, E.; Keil, R. (1994). Sorption of Strontium on Unconsolidated Glaciofluvial Deposits and Clay Minerals; Mutual Interference of Cesium, Strontium and Barium. Radiochimica acta, 64(3-4), pp. 247-252. Oldenbourg 10.1524/ract.1994.64.34.247

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In earlier studies we investigated the sorption behaviour of cesium and barium on size fractions of glaciofluvial materials and on the clay minerals montmorillonite, illite and chlorite. Here, we report on the sorption, desorption and exchange of strontium (concentration range: 1.5E-07 to 1.0E-04 M) in synthetic groundwater on the same materials. The experiments with strontium on glaciofluvial material were restricted to the <32-μηι size fraction. For this material the influence of its mineralogical composition and of the solution chemistry on the sorption of strontium was investigated. We also studied the interference of barium with the sorption of strontium on montmorillonite and on illite, and the mutual interference of cesium and barium on the <32-μηι material.
The isotherms of strontium on all materials investigated were nearly linear. The results suggest that reversible cation-exchange mechanisms on clay minerals are responsible for its sorption behaviour on the glaciofluvial material. Its dependence on the composition of the groundwater could be reproduced with a 3-site model based on two ion-exchange reactions.

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