Formation of ternary CaUO2(CO3)(3)(2-) and Ca2UO2(CO3)(3)(aq) complexes under neutral to weakly alkaline conditions

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dc.contributor.authorLee, Jun-Yeopko
dc.contributor.authorYun, Jong-Ilko
dc.date.accessioned2013-08-14T01:10:43Z-
dc.date.available2013-08-14T01:10:43Z-
dc.date.created2013-08-09-
dc.date.created2013-08-09-
dc.date.created2013-08-09-
dc.date.issued2013-
dc.identifier.citationDALTON TRANSACTIONS, v.42, no.27, pp.9862 - 9869-
dc.identifier.issn1477-9226-
dc.identifier.urihttp://hdl.handle.net/10203/175057-
dc.description.abstractThe chemical behavior of ternary Ca-UO2-CO3 complexes was investigated by using time-resolved laser fluorescence spectroscopy (TRLFS) in combination with EDTA complexation at pH 7-9. A novel TRLFS revealed two distinct fluorescence lifetimes of 12.7 +/- 0.2 ns and 29.2 +/- 0.4 ns for uranyl complexes which were formed increasingly dependent upon the calcium ion concentration, even though nearly indistinguishable fluorescence peak shapes and positions were measured for both Ca-UO2-CO3 complexes. For identifying the stoichiometric number of complexed calcium ions, slope analysis in terms of relative fluorescence intensity versus calcium concentration was employed in a combination with the complexation reaction of CaEDTA(2-) by adding EDTA. The formation of CaUO2(CO3)(3)(2-) and Ca2UO2(CO3)(3)(aq) was identified under given conditions and their formation constants were determined at I = 0.1 M Na/HClO4 medium, and extrapolated to infinitely dilute solution using specific ion interaction theory (SIT). As a result, the formation constants for CaUO2(CO3)(3)(2-) and Ca2UO2(CO3)(3)(aq) were found to be log beta(0)(113) = 27.27 +/- 0.14 and log beta(0)(213) = 29.81 +/- 0.19, respectively, providing that the ternary Ca-UO2-CO3 complexes were predominant uranium(VI) species at neutral to weakly alkaline pH in the presence of Ca2+ and CO32- ions.-
dc.languageEnglish-
dc.publisherROYAL SOC CHEMISTRY-
dc.titleFormation of ternary CaUO2(CO3)(3)(2-) and Ca2UO2(CO3)(3)(aq) complexes under neutral to weakly alkaline conditions-
dc.typeArticle-
dc.identifier.wosid000320559800012-
dc.identifier.scopusid2-s2.0-84881033845-
dc.type.rimsART-
dc.citation.volume42-
dc.citation.issue27-
dc.citation.beginningpage9862-
dc.citation.endingpage9869-
dc.citation.publicationnameDALTON TRANSACTIONS-
dc.identifier.doi10.1039/c3dt50863c-
dc.contributor.localauthorYun, Jong-Il-
dc.contributor.nonIdAuthorLee, Jun-Yeop-
dc.type.journalArticleArticle-
dc.subject.keywordPlusFLUORESCENCE SPECTROSCOPY TRLFS-
dc.subject.keywordPlusCARBONATE COMPLEXATION-
dc.subject.keywordPlusURANIUM SPECIATION-
dc.subject.keywordPlusWATERS-
dc.subject.keywordPlusU(VI)-
dc.subject.keywordPlusTEMPERATURE-
dc.subject.keywordPlusURANYL-
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