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The Uptake of Strontium by Calcium Silicate Hydrates under High pH Conditions: An Experimental Approach to Distinguish Adsorption from Co-precipitation Processes

Published online by Cambridge University Press:  01 February 2011

J. Tits ,
E. Wieland ,
J.-P. Dobler  and
D. Kunz
J. Tits
Affiliation:
Paul Scherrer Institute, Laboratory for Waste Management, CH 5232 Villigen PSI, Switzerland
E. Wieland
Affiliation:
Paul Scherrer Institute, Laboratory for Waste Management, CH 5232 Villigen PSI, Switzerland
J.-P. Dobler
Affiliation:
Paul Scherrer Institute, Laboratory for Waste Management, CH 5232 Villigen PSI, Switzerland
D. Kunz
Affiliation:
Paul Scherrer Institute, Laboratory for Waste Management, CH 5232 Villigen PSI, Switzerland
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Abstract

The interaction of Sr(II) with CSH phases has been investigated to distinguish adsorption from co-precipitation processes and to assess the relevance of these processes for performance assessments. Batch-type sorption experiments were carried out to study the adsorption of Sr(II) on synthetic CSH phases at different C:S ratios. Co-precipitation experiments were conducted by precipitating CSH phases in the presence of Sr(II) at two different precipitation rates.

Distribution ratios (Rd) of Sr(II) obtained from the sorption and co-precipitation studies were found to be similar in value. The results indicate that co-precipitation processes do not enhance Sr(II) uptake by CSH compared to adsorption. In both the co-precipitation and adsorption experiments the same sorption sites are accessible to Sr(II). The precipitation rate of the CSH phases has no significant influence on the Rd values.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , A101
Copyright
Copyright © Materials Research Society 2004

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References

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