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

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 ST...

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Autores: Meca, S., Martínez Torrents, Albert, Martí Gregorio, Vicenç|||0000-0002-1763-0514, Giménez Izquierdo, Francisco Javier|||0000-0003-2094-4458, Casas Pons, Ignasi|||0000-0002-5419-1645, Pablo Ribas, Joan de|||0000-0001-9538-7321
Formato: artículo
Fecha de publicación:2011
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/13322
Acesso em linha:https://hdl.handle.net/2117/13322
https://dx.doi.org/10.1039/c0dt01672a
Access Level:acceso abierto
Palavra-chave:Radioactive wastes -- Analysis
Uraniun (VI)
Combustibles nuclears gastats
Àrees temàtiques de la UPC::Enginyeria química::Química inorgànica::Equilibris químics
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spelling Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pHMeca, S.Martínez Torrents, AlbertMartí Gregorio, Vicenç|||0000-0002-1763-0514Giménez Izquierdo, Francisco Javier|||0000-0003-2094-4458Casas Pons, Ignasi|||0000-0002-5419-1645Pablo Ribas, Joan de|||0000-0001-9538-7321Radioactive wastes -- AnalysisUraniun (VI)Combustibles nuclears gastatsÀrees temàtiques de la UPC::Enginyeria química::Química inorgànica::Equilibris químicsThe 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.Peer Reviewed20112011-01-0120112011-09-26journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/13322https://dx.doi.org/10.1039/c0dt01672areponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/133222026-05-27T15:37:01Z
dc.title.none.fl_str_mv Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
title Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
spellingShingle Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
Meca, S.
Radioactive wastes -- Analysis
Uraniun (VI)
Combustibles nuclears gastats
Àrees temàtiques de la UPC::Enginyeria química::Química inorgànica::Equilibris químics
title_short Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
title_full Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
title_fullStr Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
title_full_unstemmed Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
title_sort Determination of the equilibrium formation constants of two U(VI)-peroxide complexes at alkaline pH
dc.creator.none.fl_str_mv Meca, S.
Martínez Torrents, Albert
Martí Gregorio, Vicenç|||0000-0002-1763-0514
Giménez Izquierdo, Francisco Javier|||0000-0003-2094-4458
Casas Pons, Ignasi|||0000-0002-5419-1645
Pablo Ribas, Joan de|||0000-0001-9538-7321
author Meca, S.
author_facet Meca, S.
Martínez Torrents, Albert
Martí Gregorio, Vicenç|||0000-0002-1763-0514
Giménez Izquierdo, Francisco Javier|||0000-0003-2094-4458
Casas Pons, Ignasi|||0000-0002-5419-1645
Pablo Ribas, Joan de|||0000-0001-9538-7321
author_role author
author2 Martínez Torrents, Albert
Martí Gregorio, Vicenç|||0000-0002-1763-0514
Giménez Izquierdo, Francisco Javier|||0000-0003-2094-4458
Casas Pons, Ignasi|||0000-0002-5419-1645
Pablo Ribas, Joan de|||0000-0001-9538-7321
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Radioactive wastes -- Analysis
Uraniun (VI)
Combustibles nuclears gastats
Àrees temàtiques de la UPC::Enginyeria química::Química inorgànica::Equilibris químics
topic Radioactive wastes -- Analysis
Uraniun (VI)
Combustibles nuclears gastats
Àrees temàtiques de la UPC::Enginyeria química::Química inorgànica::Equilibris químics
description 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.
publishDate 2011
dc.date.none.fl_str_mv 2011
2011-01-01
2011
2011-09-26
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/13322
https://dx.doi.org/10.1039/c0dt01672a
url https://hdl.handle.net/2117/13322
https://dx.doi.org/10.1039/c0dt01672a
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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