Sorption, Desorption and Exchange of Cesium on Glaciofluvial Deposits

Grütter, A.; von Gunten, H. R.; Kohler, M.; Rössler, E. (1990). Sorption, Desorption and Exchange of Cesium on Glaciofluvial Deposits. Radiochimica acta, 50(3), pp. 177-184. Oldenbourg 10.1524/ract.1990.50.3.177

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Distribution ratios and isotherms for Sorption, desorption and isotope-exchange of cesium (labelled with Cs-137) were measured on grain size fractions (<2mm) of quatemary glaciofluvial deposits. Sediment materials from two locations within Switzerland and synthetic groundwaters of different compositions were used. The investigated concentration range for cesium was 10"" — 10"' M. Cesium introduced into the system with the solid phase may influence the measurements at the lowest concentrations.
Depending on the experimental conditions, the distribution ratios vary between 3 and 30'000 ml/g. The isotherms are non-linear. Normalization of the cesium concentration in the solid with the cation-exchange capacity leads to nearly identical isotherms for all size fractions of the two geographic locations. Desorption and exchange are retarded at the higher cesium concentrations. This can be explained by structural changes in clay minerals which dominate the Sorption of cesium on this material. Variations in the composition of the groundwater influence the Sorption of cesium only sHghtly; potassium and hydrogen ions are the main competitors.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science

UniBE Contributor:

von Gunten, Hans Rudolf

ISSN:

0033-8230

Publisher:

Oldenbourg

Language:

English

Submitter:

Marceline Brodmann

Date Deposited:

23 Sep 2020 13:55

Last Modified:

23 Sep 2020 13:55

Publisher DOI:

10.1524/ract.1990.50.3.177

BORIS DOI:

10.7892/boris.115488

URI:

https://boris.unibe.ch/id/eprint/115488

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