Evaluation of the complexation behavior between humic acid and UO22+ with fluorescence spectroscopy and its mixture analysis
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T. Saito
Summary
The fluorescence of humic acid (HA) is quenched due to its complexation with UO22+ ions, leading to the evolutionary quenched intensity profile (quenching profile) as a function of UO22+ concentration. This quenching behavior was investigated using 3-dimensional (3D) and synchronous (SyF) fluorescence spectroscopy. The quenching profile obtained by means of SyF spectroscopy was deconvoluted by SIMPLISMA, which is an interactive self-modeling mixture analysis method. Two sites, which contribute to the fluorescence of HA and whose fluorescence is quenched due to its complexation with UO22+, have been extracted, and the quenching profile was resolved to the fluorescence intensity profiles of these sites and the corresponding spectra. Based on these intensity profiles, the apparent stability constant (log Kapp) and the concentration of site (CL) were evaluated for each site, using nonlinear least-squares regression to the Multisite Ryan-Weber Model.
© Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
- Cross section data for the production of the positron emitting niobium isotope 90Nb via the 90Zr(p, n)-reaction
- Transuranic elements determination in spanish NPP-wastes on the basis of gross alpha activity
- A comparative evaluation of synergistic extraction behaviour of hexavalent uranium with thenoyl tri-fluoro-acetone (HTTA) and 1-phenyl, 3-methyl, 4-benzoyl pyrazolone-5 (HPMBP) using mono-functional and bi-functional neutral donors
- Transport of Th(IV) and U(VI) through barium silico-phosphate composite membrane using electric field
- Evaluation of the complexation behavior between humic acid and UO22+ with fluorescence spectroscopy and its mixture analysis
- Investigation of sorption of Tb(III) by 2-thenoyltrifluoroacetone supported onto polyurethane foam
- Selective carrier-mediated cesium transport through polymer inclusion membranes by calix[4]arene-crown-6 carriers from complex aqueous mixtures
- Adsorption studies of zinc ions on barium titanate from aqueous solution
- The enrichment of magnesium isotopes by AM15C5 bonded ion exchanger
