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Determining Sorption Coefficients in Intact Rock Using an Electrical Potential Gradient as a Driving Force for Migration

Published online by Cambridge University Press:  21 March 2011

Magnus André ,
Maria E. Malmström  and
Ivars Neretnieks
Magnus André
Affiliation:
Chemical Engineering and Technology Royal Institute of Technology, KTH Teknikringen 26, 100 44 Stockholm, Sweden
Maria E. Malmström
Affiliation:
Chemical Engineering and Technology Royal Institute of Technology, KTH Teknikringen 26, 100 44 Stockholm, Sweden
Ivars Neretnieks
Affiliation:
Chemical Engineering and Technology Royal Institute of Technology, KTH Teknikringen 26, 100 44 Stockholm, Sweden
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Abstract

The transport of radionuclides in indigenous rock is greatly affected by the sorption of cations in the porous rock matrix. For the determination of sorption coefficients, batch experiments have traditionally been used. For these experiments, the rock sample is crushed into fine particles to reduce the experimental time. However, this procedure increases the specific surface area of the sample and the new surfaces created could have different sorption qualities than the naturally occurring surfaces, which may impair the results of sorption coefficient determinations. A new method for determining sorption coefficients in intact rock is being developed, using electromigration as a means to speed up the transport process, thereby allowing for faster equilibration between the rock sample and the tracer solution. Here, we report results from preliminary experiments, using cesium as a sorbing tracer, showing a consistent difference between sorption coefficients obtained using electromigration methods on intact rock samples and traditional batch experiments on crushed samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 12.1
Copyright
Copyright © Materials Research Society 2006

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References

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