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Title: Reduction of Se(IV) in Boom Clay: XAS solid phase speciation
Authors: Breynaert, Eric ×
Scheinost, Andreas
Dom, Dirk
Rossberg, André
Vancluysen, Jacqueline
Gobechiya, Elena
Kirschhock, Christine
Maes, André #
Issue Date: Sep-2010
Publisher: American Chemical Society
Series Title: Environmental Science & Technology vol:44 issue:17 pages:6649-6655
Abstract: The geochemical fate of selenium is of key importance for today’s society due to its role as a highly toxic essential micronutrient and as a significant component of High Level Radioactive Waste (HLRW) originating from the operation of nuclear reactors. Understanding and prediction of the long-term behavior of Se in natural environments requires identification of the in situ speciation of selenium. This
article describes an XAS-based investigation into the solid phase speciation of Se upon interaction of Se(IV) with Boom Clay, a reducing, complex sediment selected as model host rock for clay-based deep geological disposal of HLRW in Belgium and Europe. Using a combination of long-term batch sorption experiments, linear combination XANES analysis and ITFA-based EXAFS analysis allowed for the first time to identify Se0 as the dominant solid phase speciation of Se in Boom Clay systems equilibrated with Se(IV).
ISSN: 0013-936X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
Microbial and Molecular Systems - miscellaneous
× corresponding author
# (joint) last author

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