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Electron transfer during selenium reduction by iron surfaces in aqueous solution: high resolution X-ray absorption study
Stockholm University, Faculty of Science, Department of Environmental Chemistry.
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2009 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 190, no 012191, 1-4 p.Article in journal (Refereed) Published
Abstract [en]

In several designs proposed by different countries, high-level radioactive waste will be disposed in a canister with a copper outer container and a cast iron or carbon steel insert. If the iron insert comes into contact with anoxic geological water, anaerobic corrosion could take place and release fission products such as 79Se to the biosphere. This paper present studies of  the long-term kinetics of selenate (SeO42-) in the presence of iron surface under anaerobic conditions  by Near Edge X-ray Absorption Spectroscopy (XANES). Substantial changes in the selenium oxidation state is found and discussed in details. We assume that such behaviour corresponds  to the electron transfer from iron to selenium, which couldn't take place on oxidized iron surface. When selenate was in contact with polish steel foil in groundwater solution, reduction of Se and formation of Se(II-)was found.  These findings suggest that depending of corroded or oxidised iron surface, the selenium mobility in nuclear waste disposal systems will be different.

Place, publisher, year, edition, pages
2009. Vol. 190, no 012191, 1-4 p.
National Category
Environmental Sciences
Research subject
Environmental Chemistry
Identifiers
URN: urn:nbn:se:su:diva-34342DOI: 10.1088/1742-6596/190/1/012191OAI: oai:DiVA.org:su-34342DiVA: diva2:286457
Available from: 2010-01-14 Created: 2010-01-07 Last updated: 2017-12-12Bibliographically approved

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