Kinetics and mechanism of Eu(III) transfer in tributyl phosphate microdroplet/HNO 3 aqueous solution system revealed by fluorescence microspectroscopy

In this study, we reveal an Eu(III) extraction mechanism at the interface between HNO and tributyl phosphate (TBP) solutions using fluorescence microspectroscopy. The mass transfer rate constant at the interface is obtained from the analysis of fluorescence intensity changes during the forward and b...

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Bibliographic Details
Published inAnalytical sciences
Main Authors Miyagawa, Akihisa, Kusano, Yuka, Nagatomo, Shigenori, Sano, Yuichi, Nakatani, Kiyoharu
Format Journal Article
LanguageEnglish
Published Switzerland 13.05.2022
Subjects
Microspectroscopy
Interfacial reaction
Europium
Nitric acid
Tributyl phosphate
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Summary:In this study, we reveal an Eu(III) extraction mechanism at the interface between HNO and tributyl phosphate (TBP) solutions using fluorescence microspectroscopy. The mass transfer rate constant at the interface is obtained from the analysis of fluorescence intensity changes during the forward and backward extractions at various HNO and TBP concentrations to investigate the reaction mechanism. This result indicates that one nitrate ion reacts with Eu(III) at the interface, whereas TBP molecules are not involved in the interfacial reaction, which is different from the results obtained using the NaNO solution in our previous study. We demonstrate that the chemical species of Eu(III) complex with nitrate ion and TBP in the aqueous solution play an important role for the extraction mechanism. The rate constants of the interfacial reactions in the forward and backward extractions are (4.0-5.0) × 10  m M  s and (3.2-3.3) × 10  m s , respectively. We expect that our revealed mechanism provides useful and fundamental knowledge for actual solvent extraction.
ISSN:1348-2246