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Formation factor measurements in granite in the laboratory – Comparison of through diffusion and electromigration techniques.

Published online by Cambridge University Press:  11 February 2011

Martin Löfgren  and
Ivars Neretnieks
Martin Löfgren
Affiliation:
Chemical Engineering and Technology, Royal Institute of Technology, Teknikringen 26, 100 44 Stockholm, Sweden
Ivars Neretnieks
Affiliation:
Chemical Engineering and Technology, Royal Institute of Technology, Teknikringen 26, 100 44 Stockholm, Sweden
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Abstract

Traditionally the effective diffusivity in and the formation factor of intrusive igneous rock have been measured in the laboratory by through diffusion (TD) experiments, which are very time consuming in larger samples with low porosity. In previous work alternating current (AC) has been used to measure the formation factor directly in large samples. In this paper direct current is used to actually transport the tracers through the rock sample in so called through electromigration (TEM) experiments. In these experiments electoosmosis has to be corrected for. The experimental time is reduced substantially when adding an electromigratory flux to the diffusive flux. TD, TEM and AC experiments were performed on a 15 mm thick unweathered granite sample from Laxemar, Sweden. The tracers uranin and iodide were used. The formation factor measured with the three methods varied between 1.2·10-4 - 2.87·10-4.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II3.15
Copyright
Copyright © Materials Research Society 2003

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References

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