Reductive precipitation of neptunium on iron surfaces under anaerobic conditions

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dc.contributor.authorYang, H.
dc.contributor.authorCui, D.
dc.contributor.authorGrolimund, D.
dc.contributor.authorRondinella, V. V.
dc.contributor.authorBrutsch, R.
dc.contributor.authorAmme, M.
dc.contributor.authorKutahyali, C.
dc.contributor.authorWiss, A. T.
dc.contributor.authorPuranen, A.
dc.contributor.authorSpahiu, K.
dc.date.accessioned2019-10-27T10:47:54Z
dc.date.available2019-10-27T10:47:54Z
dc.date.issued2017
dc.departmentEge Üniversitesien_US
dc.description.abstractReductive 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. (C) 2017 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipEuropean 7th Framework Programme Collaborative Project RECOSY project [FP7-212287]; SKB, Sweden; PSI, Switzerland; CIAE, Chinaen_US
dc.description.sponsorshipThe batch experiments were conducted at Institute for Transuranium Elements (Karlsruhe) and China Institute of Atomic Energy (Beijing). The micro-XRF based chemical imaging and micro spectroscopic analysis was done at the microXAS beamline of the Swiss Light Source (Paul Scherrer Institut, PSI, Switzerland). C. Borca is acknowledged for assistence during these measurements. The authors wish to thank J. Cobos (ITU), M Cardinale (ITU) and E. Wieland (PSI) for their contributions to the experimental parts, as well as B. Lynch and S. V. Winckel (ITU) for the ICP-MS analysis and data evaluation. This work was supported in part by the European 7th Framework Programme Collaborative Project RECOSY project (Contract No. FP7-212287), by SKB, Sweden, PSI, Switzerland, and by CIAE, China.en_US
dc.identifier.doi10.1016/j.jnucmat.2017.07.051
dc.identifier.endpage116en_US
dc.identifier.issn0022-3115
dc.identifier.issn1873-4820
dc.identifier.issn0022-3115en_US
dc.identifier.issn1873-4820en_US
dc.identifier.startpage109en_US
dc.identifier.urihttps://doi.org/10.1016/j.jnucmat.2017.07.051
dc.identifier.urihttps://hdl.handle.net/11454/31480
dc.identifier.volume496en_US
dc.identifier.wosWOS:000414205500011en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.language.isoenen_US
dc.publisherElsevier Science Bven_US
dc.relation.ispartofJournal of Nuclear Materialsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectNuclear wasteen_US
dc.subjectNeptuniumen_US
dc.subjectIron canister materialsen_US
dc.subjectDisposalen_US
dc.subjectReductive precipitationen_US
dc.titleReductive precipitation of neptunium on iron surfaces under anaerobic conditionsen_US
dc.typeArticleen_US

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