Lifetime and fluorescence quantum yield of uranium(VI) species in hydrolyzed solutions

Meinrath, G.; Lis, Stefan; Stryla, Zdzislaw; Noubactep, Chicgoua

doi:10.1016/s0925-8388(99)00739-2

Cited by 27 publications

(20 citation statements)

References 20 publications

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“…This is in agreement with numerous previous publications dealing with the hydrolysed U(VI) species 22,24,[31][32][33][34] but is in disagreement with a single publication which clearly states that monoexponential decays are found, whatever the chemical conditions examined. 35 In this publication, reference is made to a previous publication on the U(VI)/H 2 O system (in part from the same authors) where a multi-exponential decay is observed, but no comment is made on such a fundamental discrepancy.…”

Section: Samples D E F and G These Four Samples Correspond To Varimentioning

confidence: 99%

Aqueous Solutions of Uranium(VI) as Studied by Time-Resolved Emission Spectroscopy: A Round-Robin Test

et al. 2003

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Results are presented of an interlaboratory round-robin study of the application of timeResolved Emission Spectroscopy (TRES) to the speciation of uranium(VI) in aqueous media. This involved 13 independent laboratories, using various instrumental adevices and data 2 analysis methods. In some cases, experimental data from a laboratory were analysed using different softwares. Samples were prepared based on appropriate speciation diagrams and in general were found to be chemically stable for at least six months. Four different types of aqueous uranyl solutions were studied: (i) acidic medium where UO 2 2+ aq is the single emitting species, (ii) uranyl in the presence of fluoride ions, (iii) uranyl in the presence of sulfate ions, and (iv) uranyl in aqueous solutions under various pH conditions, promoting hydrolysed species. Results between the laboratories are compared in terms of number of decay components, luminescence lifetimes and spectral band positions. The potentials and limitations of TRES in uranyl analysis and speciation in aqueous solutions are discussed.

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Section: Samples D E F and G These Four Samples Correspond To Varimentioning

confidence: 99%

Aqueous Solutions of Uranium(VI) as Studied by Time-Resolved Emission Spectroscopy: A Round-Robin Test

et al. 2003

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“…Because of electronic 1 R g ? 2 P U transitions within UV-VIS-NIR region of O-U-O unit of single type to vacant quasi-atomic orbitals of 5f shell have very characteristic spectroscopic profile (Meinrath et al 2000;Batrakov and Puchkova 2003;Hubbard and Griffiths 1987). For environmental purposes, the representative results have been obtained modeling the natural systems.…”

Section: Introductionmentioning

confidence: 99%

“…(Chappaz et al 2010;Sun et al 2014;Gu et al 2003). The concentration level has been lg L -1 (Meinrath et al 2000;Batrakov and Puchkova 2003;Hubbard and Griffiths 1987). The real pH range, however, involves pH [ 4-7 overlapped with the pH one of UO 2 (OH) 2 , UO 2 (OH) 3 -, UO 2 (OH) 2 2?…”

Section: Introductionmentioning

confidence: 99%

Environmental modeling of uranium interstitial compositions of non-stoichiometric oxides: experimental and theoretical analysis

Ivanova

Spiteller

2015

Environ Geochem Health

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Study of uranium interstitial compositions of non-stoichiometric oxides UO2+x (x ∈ 0.1-0.02) in gas and condense phases has been presented, using various soft-ionization mass spectrometric methods such as ESI-, APCI-, and MALDI-MS at a wide dynamic temperature gradient (∈ 25-300 °C). Linearly polarized vibrational spectroscopy has been utilized in order to assign unambiguously, the vibrational frequencies of uranium non-stoichiometric oxides. Experimental design has involved xUO2.66·yUO2.33, xUO2.66·yUO2.33/SiO2, xUO2.66·yUO2.33/SiO2 (NaOH) and SiO2/x'NaOH·y'UO2(NO3)2·6H2O, multicomponent systems (x = 1, y ∈ 0.1-1.0 and x' = 1, y' ∈ 0.1-0.6) as well as phase transitions UO2(NO3)2·6H2O → {U4O9(UO2.25)} → U3O7(UO2.33) → U3O8(UO2.66) → {UO3}, thus ensuring a maximal representativeness to real environmental conditions, where diverse chemical, geochemical and biochemical reactions, including complexation and sorption onto minerals have occurred. Experimental factors such as UV-irradiation, pH, temperature, concentration levels, solvent types and ion strength have been taken into consideration, too. As far as uranium speciation represents a challenging analytical task in terms of chemical identification diverse coordination species, mechanistic aspects relating incorporation of oxygen into UO 2+x form the shown full methods validation significantly impacts the field of environmental radioanalytical chemistry. UO2 is the most commonly used fuel in nuclear reactors around the globe; however, a large non-stoichiometric range ∈ UO1.65-UO2.25 has occurred due to radiolysis of water on UO2 surface yielding to H2O2, OH(·), and more. Each of those compositions has different oxygen diffusion. And in this respect enormous effort has been concentrated to study the potential impact of hazardous radionuclide on the environment, encompassing from the reprocessing to the disposal stages of the fuel waste, including the waste itself, the processes in the waste containers, the clay around the containers, and geological processes. In a broader sense, thereby, this study contributes to field of environmental analysis highlighting the great ability of various soft-ionization MS methods, particularly, MALDI-MS one, for direct assay of complex multicomponent heterogeneous mixtures at fmol-attomol concentration ranges, along with it the great instrumental features allowing, not only meaningful quantitative, but also structural information of the analytes, thus making the method indispensable for environmental speciation of radionuclides, generally.

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“…The formation constant of the species UO 2 SO 4 is rather weak for system (a) -too weak in the light of existing information. In comparison with the data collected in the JESS database [5,6] this value is at the very lower end. The value of lg b 22 is in the range of existing data only for system (c) as is shown in the comparison given in table 6.…”

Section: Resultsmentioning

confidence: 90%

“…This mine is still threatening drinking water resources due to thousands of cubic meters of free-floating acid inside the mine. Third, some information on U(VI) single component spectra of U(VI) species, mainly hydrolysis and carbonate complexation, had been collected previously [3][4][5]. The study of U(VI) sulfate interaction should [6,7] have been proposed.…”

Section: Introductionmentioning

confidence: 98%

An application of the total measurement uncertainty budget concept to the thermodynamic data of uranyl (VI) complexation by sulfate

Meinrath¹,

Lis²,

Piskuła³

et al. 2006

The Journal of Chemical Thermodynamics

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Lifetime and fluorescence quantum yield of uranium(VI) species in hydrolyzed solutions

Abstract: :Fluorescence lifetimes and emission intensities of uranium (VI)

Cited by 27 publications

References 20 publications

Aqueous Solutions of Uranium(VI) as Studied by Time-Resolved Emission Spectroscopy: A Round-Robin Test

Aqueous Solutions of Uranium(VI) as Studied by Time-Resolved Emission Spectroscopy: A Round-Robin Test

Environmental modeling of uranium interstitial compositions of non-stoichiometric oxides: experimental and theoretical analysis

An application of the total measurement uncertainty budget concept to the thermodynamic data of uranyl (VI) complexation by sulfate

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