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dc.contributor.authorGiménez Izquierdo, Francisco Javier
dc.contributor.authorDe Pablo, Joan
dc.contributor.authorCasas Pons, Ignasi
dc.contributor.authorMartínez Lladó, Xavier
dc.contributor.authorRovira Boixaderas, Miquel
dc.contributor.authorMartinez Torrents, A
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2014-12-10T12:50:20Z
dc.date.created2014-10-01
dc.date.issued2014-10-01
dc.identifier.citationGimenez, F. [et al.]. Solubility study and point of zero charge of studtite (UO2O2 center dot 4H(2)O). "Applied geochemistry", 01 Octubre 2014, vol. 49, p. 42-45.
dc.identifier.issn0883-2927
dc.identifier.urihttp://hdl.handle.net/2117/24982
dc.description.abstractThe knowledge of the characteristics of the U(VI)-peroxide chemical system is of importance because of the relevance of the uranyl peroxide solid phases studtite (UO2O2 center dot 4H(2)O) or metastudtite (UO2O2 center dot 2H(2)O) as uranyl secondary solid phases during the leaching of the spent nuclear fuel as well as to the formation in alkaline waters of soluble nanoscale uranyl peroxo cage clusters. In this work, the solubility of studtite was determined for the first time as a function of pH (from 3 to 11) by means of studtite undersaturation experiments. The results obtained showed a V-shaped solubility curve, which was modelled considering the uranyl complexes formation constants (database of the Nuclear Energy Agency, NEA) and recently published formation constants of uranium hydroxo-peroxo-complexes. The best fit of the model to the experimental solubility data was obtained with log K-sO = -2.7 +/- 0.2 for the studtite solubility reaction:; UO2O2 center dot 4H(2)O(s) + 2H(+) reversible arrow UO22+ + 4H(2)O + H2O2; On the other hand, the so-called immersion methodology was used in order to determine the pH(pzc) of studtite, which resulted to be 4.0 +/- 0.2. This value would corroborate a sorption mechanism based on electrostatic interactions described for previously published sorption data of cations (Cs+, Sr2+) on studtite. (c) 2014 Elsevier Ltd. All rights reserved.
dc.format.extent4 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria química
dc.subject.lcshUranium--Analysis
dc.subject.otherWASTE-DISPOSAL CONDITIONS
dc.subject.otherNUCLEAR-FUEL
dc.subject.otherURANIUM MINERALOGY
dc.subject.otherSPENT FUEL
dc.subject.otherCORROSION
dc.subject.otherMETASTUDTITE
dc.subject.otherSORPTION
dc.subject.otherSURFACE
dc.subject.otherUO2
dc.titleSolubility study and point of zero charge of studtite (UO2O2 center dot 4H(2)O)
dc.typeArticle
dc.subject.lemacUrani -- Anàlisi
dc.contributor.groupUniversitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials
dc.identifier.doi10.1016/j.apgeochem.2014.07.004
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0883292714001590#
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac15341981
dc.description.versionPostprint (published version)
dc.date.lift10000-01-01
local.citation.authorGimenez, F.; De Pablo, J.; Casas, I.; Martinez, X.; Rovira, M.; Martinez, A.
local.citation.publicationNameApplied geochemistry
local.citation.volume49
local.citation.startingPage42
local.citation.endingPage45


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Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain