DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Jun-Yeop | ko |
dc.contributor.author | Yun, Jong-Il | ko |
dc.date.accessioned | 2013-08-14T01:10:43Z | - |
dc.date.available | 2013-08-14T01:10:43Z | - |
dc.date.created | 2013-08-09 | - |
dc.date.created | 2013-08-09 | - |
dc.date.created | 2013-08-09 | - |
dc.date.issued | 2013 | - |
dc.identifier.citation | DALTON TRANSACTIONS, v.42, no.27, pp.9862 - 9869 | - |
dc.identifier.issn | 1477-9226 | - |
dc.identifier.uri | http://hdl.handle.net/10203/175057 | - |
dc.description.abstract | The 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.language | English | - |
dc.publisher | ROYAL SOC CHEMISTRY | - |
dc.title | Formation of ternary CaUO2(CO3)(3)(2-) and Ca2UO2(CO3)(3)(aq) complexes under neutral to weakly alkaline conditions | - |
dc.type | Article | - |
dc.identifier.wosid | 000320559800012 | - |
dc.identifier.scopusid | 2-s2.0-84881033845 | - |
dc.type.rims | ART | - |
dc.citation.volume | 42 | - |
dc.citation.issue | 27 | - |
dc.citation.beginningpage | 9862 | - |
dc.citation.endingpage | 9869 | - |
dc.citation.publicationname | DALTON TRANSACTIONS | - |
dc.identifier.doi | 10.1039/c3dt50863c | - |
dc.contributor.localauthor | Yun, Jong-Il | - |
dc.contributor.nonIdAuthor | Lee, Jun-Yeop | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | FLUORESCENCE SPECTROSCOPY TRLFS | - |
dc.subject.keywordPlus | CARBONATE COMPLEXATION | - |
dc.subject.keywordPlus | URANIUM SPECIATION | - |
dc.subject.keywordPlus | WATERS | - |
dc.subject.keywordPlus | U(VI) | - |
dc.subject.keywordPlus | TEMPERATURE | - |
dc.subject.keywordPlus | URANYL | - |
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