Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH

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dc.contributor	Universitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.contributor	Universitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials
dc.contributor.author	Meca, S.
dc.contributor.author	Martínez Torrents, Albert
dc.contributor.author	Martí Gregorio, Vicenç
dc.contributor.author	Giménez Izquierdo, Francisco Javier
dc.contributor.author	Casas Pons, Ignasi
dc.contributor.author	Pablo Ribas, Joan de
dc.date	2011
dc.identifier.citation	Meca, S. [et al.]. Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH. "Dalton transactions", 2011, vol. 40, núm. 31, p. 7976-7982.
dc.identifier.citation	1477-9226
dc.identifier.citation	10.1039/c0dt01672a
dc.identifier.uri	http://hdl.handle.net/2117/13322
dc.language.iso	eng
dc.relation	http://pubs.rsc.org/en/content/articlelanding/2011/DT/C0DT01672A
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Àrees temàtiques de la UPC::Enginyeria química::Química inorgànica::Equilibris químics
dc.subject	Radioactive wastes -- Analysis
dc.subject	Uraniun (VI)
dc.subject	Combustibles nuclears gastats
dc.title	Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
dc.type	info:eu-repo/semantics/publishedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	The formation of uranyl-peroxide complexes was studied at alkaline media by using UV-Visible spectrophotometry and the STAR code. Two different complexes were found at a H2O2/U(VI) ratio lower than 2. A graphical method was used in order to obtain the formation constants of such complexes and the STAR program was used to refine the formation constants values because of its capacity to treat multiwavelength absorbance data and refining equilibrium constants. The values obtained for the two complexes identified [...] At hydrogen peroxide concentrations higher than 10-5 mol dm-3, and in the absence of carbonate, the UO2(O2)2(OH)2 4- complex is predominant in solution, indicating the significant peroxide affinity of peroxide ions for uranium and the strong complexes of uranium(VI) with peroxide.
dc.description.abstract	Peer Reviewed

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