Uranium Speciation in Solution by Time-Resolved Laser-Induced Fluorescence

Moulin, Christophe; Decambox, P.; Moulin, Valérie; Decaillon, Jean Gary.

doi:10.1021/ac00098a019

Cited by 166 publications

(122 citation statements)

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“…In the case where the log 10 K values would be assumed for the various equilibria, as is commonly done in the literature, 12,14,15,22,23,31,32 this would restrict the species attributions to those being present in the pH range for which the peaks are observed. In the case where the log 10 K values would be sought from the TRES measurements, as has been done for various systems, 8,14,33,36 this would set some limits to the equilibrium reaction constants involving these species.…”

Section: +mentioning

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: +mentioning

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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“…Geochemical modelling of uranyl solutions in equilibrium with atmospheric CO 2 reported in the literature [2,15] …”

Section: Geochemical Modellingmentioning

confidence: 99%

“…In the pH range 5 to 7, other cationic species (such as UO 2 OH + , and (UO 2 ) 3 (OH) 5 + ) as well as neutral and anionic species (such as UO 2 CO 3 , and (UO 2 ) 2 CO 3 (OH) 3 -) are important. At pH values much above 8, only anionic species (such as UO 2 (CO 3 ) 2 2-and UO 2 (CO 3 ) 3 4-) tend to be significant [1,2].…”

Section: Introductionmentioning

confidence: 99%

Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

Barton

Stewart

Morris

et al. 2004

Journal of Hazardous Materials

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Three materials that are designed to treat uranium-contaminated water were investigated.These are a cation exchange resin, IRN77, an anion exchange resin, Varion AP, and a recently developed material called PANSIL (quartz sand coated with 2% amidoxime resin by wt.). The reaction rate, capacity, and effective pH range of the three materials are reported. The capacity and conditional distribution coefficient in neutral, uranyl contaminated synthetic groundwater containing carbonate are also reported. The suitability of each material for treating uraniumcontaminated groundwaters using a permeable reactive barrier approach is then discussed.All three materials react rapidly in the pH range 5-7, reaching equilibrium in less than 4 hours at ~23°C. The unconditioned cation exchange resin removed 8 g UO 2 2+ per kg of resin from neutral synthetic groundwater containing 30 mg/l of UO 2 2+ , but a lower capacity is anticipated in groundwater with either higher ionic strength or lower UO 2 2+ concentrations. It operates by first acidifying the solution, then sorbing UO 2 2+ , and can release UO 2 2+ when its buffering capacity has been exhausted. The anion exchange resin is very effective at removing anionic uranyl carbonate species from solutions with a pH above 5, with good specificity. Up to 50 g/kg of uranium is removed from contaminated groundwater at neutral pH. PANSIL is effective at sequestering cationic and neutral uranyl species from solutions in the pH range 4.5 to 7.5, with very good specificity. The capacity of PANSIL is pH dependent, increasing from about 0.4 g/kg at pH 4.5, to about 1 g/kg at pH 6 and 1.5 g/kg around pH 7.5. In neutral groundwater containing carbonate, both the anion exchange resin and PANSIL exhibit conditional distribution coefficients exceeding 1470 ml/g, which is about an order of magnitude higher than comparable reactive barrier materials reported in the literature.

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“…La SLRT a été utilisée depuis quelques années dans de nombreuses applications de dosages d'actinides ou de terres rares par mesures de fluorescence (Berthoud, 1988 ;Deniau, 1993 ;Moulin, 1990 ;Moulin, 1995). Son application au dosage de l'uranium dans les urines est relativement récente (Decambox, 1991).…”

Section: Appareillageunclassified

La mesure de l'excrétion urinaire de l'uranium par spectrofluorimétrie laser à résolution temporelle

et al. 1999

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The measurement of the urinary excretion of uranium by time-molved laser-induced fluorescence (TRLJF).Rapid direct measurements of the urinary excretion of uranium are often disturbed by metabolic uncerîainties and analytical interferences. One consequence of these phenomena is detection limits or uncerîainties that are tao hi@. The technique proposed here associates rapid processing of the sample with an optimised measurement system. The objectives of the study -rapidity of response, accuracy and precision lower than 10% and ease of operation -are attained by using a solid power laser as excitation source in conjunction with a modified commercial fluorimeter. We describe the analytical stages for the two methods used (direct measurement and measurement after mineraiisation of the sample). The experimentai mults achieved with 120 measurements are compared with the results obtained by extraction chromatography. The advantages and drawbacks of the TRLIF technique are discussed. Finally, the values of the naturai urinary excretion of uranium among 80 non-exposed workers from the Marcoule region are presented as a hinction of the analytical technique selected.

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Uranium Speciation in Solution by Time-Resolved Laser-Induced Fluorescence

Cited by 166 publications

References 0 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

Performance of three resin-based materials for treating uranium-contaminated groundwater within a PRB

La mesure de l'excrétion urinaire de l'uranium par spectrofluorimétrie laser à résolution temporelle

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