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Reductive precipitation of neptunium on iron surfaces under anaerobic conditions
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Studsvik Nuclear AB, Sweden; China Institute of Atomic Energy, China.
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Number of Authors: 102017 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 496, p. 109-116Article in journal (Refereed) Published
Abstract [en]

Reductive precipitation of the radiotoxic nuclide Np-237 from nuclear waste on the surface of iron canister material at simulated deep repository conditions was investigated. Pristine polished as well as pre corroded iron specimens were interacted in a deoxygenated solution containing 10-100 mu M Np(V), with 10 mM NaCl and 2 mM NaHCO3 as background electrolytes. The reactivity of each of the two different systems was investigated by analyzing the temporal evolution of the Np concentration in the reservoir. It was observed that pre-oxidized iron specimen with a 40 tm Fe3O4 corrosion layer are considerably more reactive regarding the reduction and immobilization of aqueous Np(V) as compared to pristine polished FeM surfaces. Np-237 immobilized by the reactive iron surfaces was characterized by scanning electron microscopy as well as synchrotron-based micro-X-ray fluorescence and X-ray absorption spectroscopy. At the end of experiments, a 5-8 tm thick Np-rich layer was observed to be formed ontop of the Fe3O4 corrosion layer on the iron specimen. The findings from this work are significant in the context of performance assessments of deep geologic repositories using iron as high level radioactive waste (HLW) canister material and are of relevance regarding removing pollutants from contaminated soil or groundwater aquifer systems.

Place, publisher, year, edition, pages
2017. Vol. 496, p. 109-116
Keywords [en]
Nuclear waste, Neptunium, Iron canister materials, Disposal, Reductive precipitation
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-149956DOI: 10.1016/j.jnucmat.2017.07.051ISI: 000414205500011OAI: oai:DiVA.org:su-149956DiVA, id: diva2:1170376
Available from: 2018-01-03 Created: 2018-01-03 Last updated: 2018-01-03Bibliographically approved

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