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Consistency of the strontium transport parameters in Boom Clay obtained from different types of migration experiments

Published online by Cambridge University Press:  15 February 2011

Marc Aertsens ,
Norbert Maesa  and
Marc Van Gompel
Marc Aertsens
Affiliation:
Waste & Disposal Department, SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
Norbert Maesa
Affiliation:
Waste & Disposal Department, SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
Marc Van Gompel
Affiliation:
Waste & Disposal Department, SCK•CEN, Boeretang 200, B-2400 Mol, Belgium
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Abstract

The consistency of migration parameters obtained by different methods is examined for strontium in Boom Clay. In addition to a previous in-situ percolation experiment and electromigration experiments (using an electrical field as driving force), a lab percolation test and two through-diffusion tests (on clay cores of different lengths) have been performed.

All experiments lead to a robust value for the apparent diffusion coefficient of strontium between 5 ? 10−12 m2/s and 1 ? 10−11 m2/s.

No reliable value is obtained for the product ηR of the diffusion accessible porosity and theretardation factor R. For one of the through-diffusion experiments, the concentration decrease inthe inlet as a function of time was fitted simultaneously with the strontium profile in the clay,leading to a ηR value around 400. Estimating ηR at the inlet/clay interface as the ratio of thebulk concentration and the pore water concentration leads to a similar value. The valuesobtained from the strontium profiles in the percolation and electromigration experiments are inline as well. However, fitting for both through-diffusion tests the outlet concentrations versustime leads to very low and unrealistic values of ηR (0.15 and 0.5).

Modeling shows that the transport of strontium in Boom Clay cannot be satisfactorilydescribed with the current assumptions (like e.g. instantaneous linear sorption equilibrium andboundary conditions), meaning that there is a problem to obtain a reliable value for the product ηR for strontium in Boom Clay.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1193: Scientific Basis for Nuclear Waste Management XXXIII , 2009 , 421
Copyright
Copyright © Materials Research Society 2009

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