DC Field | Value | Language |
---|---|---|
dc.contributor.author | Jo, Yongheum | ko |
dc.contributor.author | Cho, Hye-Ryun | ko |
dc.contributor.author | Yun, Jong-Il | ko |
dc.date.accessioned | 2020-09-18T04:01:44Z | - |
dc.date.available | 2020-09-18T04:01:44Z | - |
dc.date.created | 2020-08-10 | - |
dc.date.issued | 2020-07 | - |
dc.identifier.citation | DALTON TRANSACTIONS, v.49, no.33, pp.11605 - 11612 | - |
dc.identifier.issn | 1477-9226 | - |
dc.identifier.uri | http://hdl.handle.net/10203/276112 | - |
dc.description.abstract | We present the first experimental evidence for the ternary complexation of calcium and magnesium ions with plutonyl(VI)tricarbonate species in carbonate-containing aqueous solutions using visible-NIR spectrophotometric titration. Prior to studying the ternary plutonyl(VI) carbonate complexation, visible-NIR absorption spectral information of PuO2(CO3)(2)(2-) and PuO2(CO3)(3)(4-) was successfully obtained. PuO2(CO3)(2)(2-) has a prominent peak at 853 nm and its molar absorptivity was determined to be epsilon(853, PuO2)(CO3)(2)(2-) = 49.0 +/- 4.2 M-1.cm(-1). The spectrophotometric titration results by adding calcium or magnesium to the plutonyl(VI) carbonate system consisting of PuO2(CO3)(2)(2-) and PuO2(CO3)(3)(4-) indicate the formation of CaPuO2(CO3)(3)(2-) and MgPuO2(CO3)(3)(2-) complexes and provide the formation constants at 0.1 M H/NaClO4 for MPuO2(CO3)(3)(2-) from PuO2(CO3)(3)(4-), log K = 4.33 +/- 0.50 and 2.58 +/- 0.18 for M = Ca2+ and Mg2+, respectively. In addition, the formation constants of CaPuO2(CO3)(3)(2-) and MgPuO2(CO3)(3)(2-) from PuO2(CO3)(3)(4-) at infinite dilution (log K degrees) were proposed to be 6.05 +/- 0.50 and 4.29 +/- 0.18, respectively, based on the correction of ionic strength using the Davies equation. The absorption spectrum of the ternary plutonyl(VI) complexes of CaPuO2(CO3)(3)(2-) is similar to that of PuO2(CO3)(3)(4-) with the exception of a characteristic absorption peak at 808 nm (epsilon(808, CaPuO2(CO3)32-) = 42.9 +/- 1.6 M-1.cm(-1)). According to the calculated aqueous plutonyl(VI) speciation including the ternary plutonyl(VI) complexes, CaPuO2(CO3)(3)(2-) is considered the dominant Pu(VI) species under environmental conditions, and plutonyl(VI) may be more mobile than expected in previous assessments. | - |
dc.language | English | - |
dc.publisher | ROYAL SOC CHEMISTRY | - |
dc.title | Visible-NIR absorption spectroscopy study of the formation of ternary plutonyl(VI) carbonate complexes | - |
dc.type | Article | - |
dc.identifier.wosid | 000563083800016 | - |
dc.identifier.scopusid | 2-s2.0-85090073142 | - |
dc.type.rims | ART | - |
dc.citation.volume | 49 | - |
dc.citation.issue | 33 | - |
dc.citation.beginningpage | 11605 | - |
dc.citation.endingpage | 11612 | - |
dc.citation.publicationname | DALTON TRANSACTIONS | - |
dc.identifier.doi | 10.1039/d0dt01982h | - |
dc.contributor.localauthor | Yun, Jong-Il | - |
dc.contributor.nonIdAuthor | Cho, Hye-Ryun | - |
dc.description.isOpenAccess | Y | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | FORMATION-CONSTANTS | - |
dc.subject.keywordAuthor | NACL SOLUTION | - |
dc.subject.keywordAuthor | PLUTONIUM | - |
dc.subject.keywordAuthor | URANIUM | - |
dc.subject.keywordAuthor | CALCIUM | - |
dc.subject.keywordAuthor | SPECIATION | - |
dc.subject.keywordAuthor | STABILITY | - |
dc.subject.keywordAuthor | URANYL | - |
dc.subject.keywordAuthor | U(VI) | - |
dc.subject.keywordAuthor | SOLUBILITY | - |
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