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Adsorption and diffusion of strontium in simulated rock fractures quantified via ion beam analysis

Published online by Cambridge University Press:  05 July 2018

T. Ohe ,
B. Zou ,
K. Noshita ,
I. Gomez-Morilla ,
C. Jeynes ,
P. M. Morris  and
R. A. Wogelius
T. Ohe
Affiliation:
Energy, Engineering and Science Department, Tokai University, 1117 Kita Kaname, Hiratsuka-shi, Kanagawa 259-1292, Japan
B. Zou
Affiliation:
Williamson Research Centre for Molecular Environmental Science and School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
K. Noshita
Affiliation:
Energy and Environmental Systems Laboratory, Hitachi Ltd, 7-2-1 Omika, Hitachi-shi, Ibaraki 319-1221, Japan
I. Gomez-Morilla
Affiliation:
University of Surrey Ion Beam Centre, Guildford GU2 7XH, UK
C. Jeynes
Affiliation:
University of Surrey Ion Beam Centre, Guildford GU2 7XH, UK
P. M. Morris
Affiliation:
Williamson Research Centre for Molecular Environmental Science and School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
R. A. Wogelius*
Affiliation:
Williamson Research Centre for Molecular Environmental Science and School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK
*
*E-mail: [email protected]
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Abstract

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An experimental technique has been developed and applied to the problem of determining effective diffusion coefficients and partition coefficients of Sr in low permeability geological materials. This technique, the micro-reactor simulated channel method (MRSC), allows rapid determination of contaminant transport parameters with resulting values comparable to those determined by more traditional methods and also creates product surfaces that are amenable for direct chemical analysis. An attempt to further constrain mass flux was completed by detailed ion beam analysis of polished tuff surfaces (tuff is a polycrystalline polyminerallic aggregate dominated by silicate phases) that had been reacted with Sr solutions at concentrations of 10−5, 10−3 and 10−1 mol l−1. Ion beam analysis was carried out using beams of both protons (using particle induced X-ray emission and elastic backscattering spectrometry or EBS) and alpha-particles (using Rutherford backscattering spectrometry). The ion beam analyses showed that increased solution concentrations resulted in increased surface concentrations and that in the highest concentration experiment, Sr penetrated to at least 4 μm below the primary interface. The Sr surface concentrations determined by EBS were 0.06 (±0.05), 0.87 (±0.30) and 2.40 (±1.0) atomic weight % in the experiments with starting solution concentrations of 10−5, 10−3, and 10−1 mol l−1, respectively.

Keywords

beam analysis (IBA)particle induced X-ray emission (PIXE)elastic backscattering spectrometry (EBS)rutherford backscattering spectrometry (RBS)strontium
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 8 , December 2012 , pp. 3203 - 3215
Creative Commons
Creative Common License - CCCreative Common License - BY
© [2012] The Mineralogical Society of Great Britain and Ireland. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

Footnotes

†

Current address: Technische Universität Dresden, Institut für Strömungsmechanik, Lehrstuhl für Magnetofluiddynamik, 01062 Dresden, Germany

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