1. Home page
  2. Search

THE INFLUENCE OF REDUCTIVE DISSOLUTION OF IRON OXIDES BY S(-II) ON URANIUM MOBILITY

This item is provided by the institution :
Geological Society of Greece   

Repository :
Bulletin of the Geological Society of Greece  | ΕΚΤ eJournals   

see the original item page
in the repository's web site and access all digital files if the item*



THE INFLUENCE OF REDUCTIVE DISSOLUTION OF IRON OXIDES BY S(-II) ON URANIUM MOBILITY (EN)
Alexandratos, V. G.
Van Cappellen, P.
Behrends, T.
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
2010-01-01
This study investigates possible redox transformations of uranium under Ntransient redox conditions. NSpecific focus lies on the fate of U as reductive dissolution of iron oxyhydroxides by S(-II) is initiated. In batch experiments sulfide was incrementally added to a lepidocrocite suspension containing adsorbed U(VI). The partitioning of uranium was monitored during the progressing transformation of lepidocrocite into FeS. Synchrotron-based X-ray absorption spectroscopy was used to resolve the oxidation state of uranium.Upon addition of sulfide intermediate release of U from the solid to the solution was observed. The mobilization of U was followed by immobilization in later stages. XAS reveals that this immobilization coincides with reduction of NU(VI) to U(IV). Consequently, reduction of U(VI) and precipitation of U(IV) solids, due to a shift from oxic to sulfate reducing conditions is possible. NHowever, kinetic effects might lead to an intermediate mobilization of U that should be considered for the risk assessment of nuclear waste repositories and the remediation of sites, contaminated with radionuclides. (EN)
reductive dissolution (EN)
uranium mobilization (EN)
iron mineral transformation (EN)
iron sulfides (EN)
redox transitions (EN)
X-ray absorption spectroscopy (EN)
Δελτίο της Ελληνικής Γεωλογικής Εταιρίας
English
Geological Society of Greece (EN)
0438-9557
2529-1718
Δελτίο της Ελληνικής Γεωλογικής Εταιρείας; Τόμ. 43 Αρ. 5 (2010): 12o Διεθνές Συνέδριο της Ελληνικής Γεωλογικής Εταιρίας; 2310-2318 (EL)
Bulletin of the Geological Society of Greece; Vol. 43 No. 5 (2010): 12th International Conference of the G.S.G.; 2310-2318 (EN)
https://creativecommons.org/licenses/by-nc/4.0
Copyright (c) 2017 V. G. Alexandratos, T. Behrends, P. Van Cappellen (EN)
Geological Society of Greece
Bulletin of the Geological Society of Greece
Geochemistry and Ore Deposit Geology



*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)