A new time-resolved laser-induced fluorescence spectrometry (TRLFS) data acquisition procedure applied to the uranyl-phosphate system
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Isabelle Bonhoure
TRLFS has been used to study the UVIO22+-PO43- system, in the 1 to 5 pH range, for [PO43-] = 2 × 10-3 to 1.02 × 10-1 M range and [UO22+] = 1.2 × 10-5 M. The data acquisition procedure was based on four different sets of acquisition parameters, which were chosen in order to maximize the fluorescence signal for four different time domains. The fitting procedure used to simulate the corresponding fluorescence decays curves was based on the crosscheck of the fitting results and on the inter-comparison between results for solutions of different concentrations. Five different lifetimes τ1 to τ5 were evidenced and associated with five uranyl species (UO2(H2PO4)2, UO2H2PO4+, UO2HPO4, UO2PO4- and UO22+). The fitting results, moreover, allowed the distinction between mono-, bi- and tri-exponential fluorescence decay behaviours. The isolated fluorescence spectra showed an expected wavelength shift between the fluorescence spectra of all the complexes, except in the case of the (UO2(H2PO4)2, UO2H2PO4+) couple, which spectra were not distinguishable. Finally, the obtained results have shown that the data acquisition and fitting procedure enabled a complete and reliable characterization of the studied solutions.
© Oldenbourg Wissenschaftsverlag
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Articles in the same Issue
- Yield and excitation function measurements of some nuclear reactions on natural thallium induced by protons leading to the production of medical radioisotopes 201Tl and 203Pb
- Production of no-carrier-added 123I via heavy-ion activation of natural antimony oxide
- Sorption behavior of curium(III) on hydrous silica: a kinetic and thermodynamic study
- Study of the solubility of amorphous and crystalline uranium dioxide by combined spectroscopic methods
- Complexation of uranium(VI) with aromatic acids in aqueous solution – a comparison of hydroxamic acids and benzoic acid
- N,N,N′,N′-tetraoctyl-3-oxapentane-1,5-diamide impregnated magnetic particles for the uptake of lanthanides and actinides from nuclear waste streams
- A new time-resolved laser-induced fluorescence spectrometry (TRLFS) data acquisition procedure applied to the uranyl-phosphate system
- Comparative study on ion-isotopic exchange reaction kinetics by application of tracer technique
- Kinetics of isotopic exchange between calcium molybdate and molybdate ions in aqueous solution
- Separation of 137mBa from its parent 137Cs from an equilibrium mixture using amide incorporated Amberlite IRC-50
