Abstract
A microcapillary manipulation system combined with fluorescence microspectroscopy enabled us to analyze mass transfer in a single particle. In this study, we revealed the Eu(III) distribution in a single diglycolamide-derivative extractant (TODGA)-impregnated polymer-coated silica particle. The reaction of Eu(III) with two TODGA molecules in the polymer layer was the rate-limiting process, which was revealed by the relationship between the rate constants (k1 and k-1) and concentrations of Eu(III) and HNO3. The decrease in the crosslinking degree of the polymer layer caused an increase in only k-1. This indicates that hydrophilic environments at lower crosslinking degrees enhance the stability of the charged Eu(III) species such as Eu3+, Eu(NO3)2+, and Eu(NO3)2+.
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The authors received no financial support for this study. The SEM image was obtained using electron probe micro analyzer at the Chemical Analysis Division and Open Facility, Research Facility Center for Science and Technology, University of Tsukuba.
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Miyagawa, A., Takahashi, T., Kuzure, Y. et al. Eu(III) transfer in single N,N,N’,N’-tetraoctyldiglycolamide-impregnated polymer-coated silica particle using fluorescence microspectroscopy: transfer mechanism and effect of polymer crosslinking degree. ANAL. SCI. 39, 1929–1936 (2023). https://doi.org/10.1007/s44211-023-00402-9
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DOI: https://doi.org/10.1007/s44211-023-00402-9