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Reductive immobilization of Se-79 by iron canister under simulated repository environment
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Environmental Chemistry.
Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, Department of Physical, Inorganic and Structural Chemistry.
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2009 (English)In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 282, no 2, 349-354 p.Article in journal (Refereed) Published
Abstract [en]

To understand the fate of Se-79 in a repository-like environment, the interactions between iron canister surface with dissolved selenite (SeO3 (2-)) and selenate (SeO4 (2-)) in anaerobic solutions have been investigated. Se(IV) immobilization on iron surface was observed to be about 100 times faster than that of Se(VI) at same conditions. An iron surface coated with a FeCO3 layer corrosion product is more reactive than a polished iron to immobilize Se(IV) and Se(VI). The reacted iron surfaces were analysed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Raman spectrometry and micro-X-ray Absorption Spectroscopy (XAS). The result show that Se(IV) and Se(VI) were reduced and precipitated. The dominating phase was found to be FeSe2..

Place, publisher, year, edition, pages
2009. Vol. 282, no 2, 349-354 p.
Keyword [en]
Reductive immobilization, Selenium, Iron canister, Nuclear waste, Repository
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-59690DOI: 10.1007/s10967-009-0328-8ISI: 000271672300005OAI: oai:DiVA.org:su-59690DiVA: diva2:430156
Note
8Available from: 2011-07-07 Created: 2011-07-05 Last updated: 2017-12-11Bibliographically approved

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