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Study of 85Sr transport through a column filled with crushed granite in the presence of bentonite colloids

By
Kateřina Kolomá
Kateřina Kolomá
Fuel Cycle Chemistry Department, ÚJV Řež, a. s., Hlavní 130, Řež, 250 68 Husinec, Czech Republic
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Radek Červinka
Radek Červinka
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Published:
January 01, 2017

Abstract

The present work is focused on the study of strontium transport through crushed granite in the presence of bentonite colloids under dynamic arrangement. The aim of the experiments was to investigate the effect of bentonite colloids on strontium migration in crushed granite. The tracer behaviour was studied in a column set-up under aerobic conditions with a continuous inlet of the liquid phase of a constant tracer concentration (activity) and flow rate. Defined volumes of liquid phase were sampled at periodic time intervals at the column outlet for the measurements of tracer concentrations (activity). The transport was described by breakthrough curves. The stepwise approach included these steps: (1) an evaluation of the hydrodynamic column properties by the non-sorbing tracer 3H; (2) a column experiment with bentonite colloids in deionized water was performed; (3) migration of 85Sr solution in two liquid phases (deionized and synthetic granitic water); and (4) the transport of a radiocolloid suspension in deionized water was studied. Results showed different behaviour of bentonite colloids and strontium in the column. Bentonite colloids behaved as a non-sorbing tracer: conversely, strontium showed strong sorption on granitic material. The strontium transport in the presence of bentonite colloids differed from strontium transport itself. The strontium transport in the presence of colloids was faster than transport without the bentonite colloids. The observed retention of strontium on granite suggests a higher affinity of strontium towards granitic rock than towards bentonite colloids, and showed the reversibility of the sorption of strontium on bentonite colloids.

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Geological Society, London, Special Publications

Radioactive Waste Confinement: Clays in Natural and Engineered Barriers

S. Norris
S. Norris
Radioactive Waste Management, UK
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J. Bruno
J. Bruno
Amphos 21, Spain
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M. van Geet
M. van Geet
ONDRAF/NIRAS, Belgium
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E. Verhoef
E. Verhoef
COVRA, The Netherlands
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Geological Society of London
Volume
443
ISBN electronic:
9781786203267
Publication date:
January 01, 2017

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