Observation of aqueous Cm(III)/Eu(III) and UO22+ nanoparticulates at concentrations approaching solubility limit by laser-induced fluorescence spectroscopy

Wang, Zheming; Felmy, Andrew R.; Xia, Yuanxian; Buck, Edgar C.

doi:10.1016/j.jallcom.2005.07.080

Cited by 6 publications

(8 citation statements)

References 24 publications

(33 reference statements)

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“…Both compounds showed strong luminescence with emission spectral maxima located at 616.6 nm for Eu 2:1 and 690.5 nm for Am 2:1 (Figure A,B). These spectral positions are similar to those observed in other Eu(III) and Am(III) complexes. , The profiles of the emission spectra recorded at different delay times (data not shown) remained the same for both Eu 2:1 and Am 2:1 , suggesting a single Eu(III)/Am(III) coordination environment in these compounds. Consistent with these observations, the luminescence decays of both Eu 2:1 and Am 2:1 showed single exponential decays (Figure S5A,B in the Supporting Information) with luminescence lifetimes of 749 ± 70 μs for Eu 2:1 and 228 ± 6 ns for Am 2:1 , calculated for data from triplicate measurements.…”

Section: Resultssupporting

confidence: 84%

“…These spectral positions are similar to those observed in other Eu(III) and Am(III) complexes. 51,52 The profiles of the emission spectra recorded at different delay times (data not shown) remained the same for both Eu 2:1 and Am 2:1, suggesting a single Eu(III)/Am(III) coordination environment in these compounds. Consistent with these observations, the luminescence decays of both Eu 2:1 and Am 2:1 showed single exponential decays (Figure S5A,B in the Supporting a N L refers to the nitrogen atom in ligand L. Ionic radii 48 are listed with respect to the coordination numbers indicated as Roman numerals.…”

Section: Inorganic Chemistrymentioning

confidence: 80%

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Crystallographic and Spectroscopic Characterization of Americium Complexes Containing the Bis[(phosphino)methyl]pyridine-1-oxide (NOPOPO) Ligand Platform

et al. 2018

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The crystal structures of americium species containing a common multifunctional phosphine oxide ligand, reported for its ability to extract f elements from acidic solutions, namely, 2,6-[PhP(O)CH]CH-NO, L, were finally determined after over three decades of separations studies involving these species and their surrogates. The molecular compounds Am(L)(NO), Am 1:1, and [Am(L)(NO)][2(NO)], Am 2:1, along with their neodymium and europium analogues, were synthesized and characterized using single-crystal X-ray crystallography, attenuated total reflectance Fourier transform infrared spectroscopy, and luminescence spectroscopy to provide a comprehensive comparison with new and known analogous complexes.

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Section: Resultssupporting

confidence: 84%

Section: Inorganic Chemistrymentioning

confidence: 80%

Crystallographic and Spectroscopic Characterization of Americium Complexes Containing the Bis[(phosphino)methyl]pyridine-1-oxide (NOPOPO) Ligand Platform

et al. 2018

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“…Testimony of these efforts are the publications previously mentioned of the NEA-TDB reviews, as well as the many specific experimental works, which have been mainly conducted at room temperature. Nevertheless, not so many of these experiments were performed at temperatures above 20-25 °C, although higher temperatures can help stabilizing solid phases, which is a prerequisite when performing solubility measurements (Giffaut, 1994 (Altmaier et al, 2004;Wang et al, 2006) in the metastability domain around the solubility limits (see Figure 7.2 in Stumm and Morgan, 1996). This requires the use of adequate techniques for particle detection (Walther, 2003), 10/41 and often complicates the validation of solubility data interpretation models with equilibrium reactions.…”

Section: The Carbonate Systemmentioning

confidence: 99%

Thermodynamic data provided through the FUNMIG project: Analyses and prospective

Reiller

Vercouter

Duro

et al. 2012

Applied Geochemistry

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International audienceIn this paper some of the needs for good quality thermodynamic data in radioactive waste management are highlighted. A presentation of the thermodynamic data produced within the 6th EC framework programme integrated project FUNMIG (Fundamental processes of radionuclide migration) and how these have helped in filling relevant thermodynamic data gaps is given. The manuscript does not intend to be a complete review of thermodynamic data, but a short overview of the aqueous complexation of Am(III), lanthanides (III), U(VI), and Th(IV) by sulfates, silicates, carbonates and phosphates. The work presented is based on the latest developments published in the literature and specifically addressed within the IP FUNMIG

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“…In their study, particle adsorption at etched calcite surfaces with surface steps and pits in the nanometer scale showed mineral surface heterogeneity over large areas (up to >200 000 μm 2 ) and the importance of surface roughness on colloid retention. 31 Moreover, several studies reported the individual sorption behavior of radionuclides, for example, Cm(III), 45,46 Eu-(III), 44,46 Am(III), 3,45,47 Th(IV), 44,47 Np(V), 47 Pu(IV), 47,48 U(VI) 44,47 and colloids as well as colloid retention in the presence of radionuclides at mineral surfaces. These studies focused on the impact of pH, 24 zeta potentials of colloids and interfaces, 49 system ionic strength, 50−52 and colloidal size.…”

Section: ■ Introductionmentioning

confidence: 99%

Site-Specific Retention of Colloids at Rough Rock Surfaces

Darbha

Luetzenkirchen

Schäfer

2012

Environ. Sci. Technol.

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The spatial deposition of polystyrene latex colloids (d = 1 μm) at rough mineral and rock surfaces was investigated quantitatively as a function of Eu(III) concentration. Granodiorite samples from Grimsel test site (GTS), Switzerland, were used as collector surfaces for sorption experiments. At a scan area of 300 × 300 μm(2), the surface roughness (rms roughness, Rq) range was 100-2000 nm, including roughness contribution from asperities of several tens of nanometers in height to the sample topography. Although, an increase in both roughness and [Eu(III)] resulted in enhanced colloid deposition on granodiorite surfaces, surface roughness governs colloid deposition mainly at low Eu(III) concentrations (≤5 × 10(-7) M). Highest deposition efficiency on granodiorite has been found at walls of intergranular pores at surface sections with roughness Rq = 500-2000 nm. An about 2 orders of magnitude lower colloid deposition has been observed at granodiorite sections with low surface roughness (Rq < 500 nm), such as large and smooth feldspar or quartz crystal surface sections as well as intragranular pores. The site-specific deposition of colloids at intergranular pores is induced by small scale protrusions (mean height = 0.5 ± 0.3 μm). These protrusions diminish locally the overall DLVO interaction energy at the interface. The protrusions prevent further rolling over the surface by increasing the hydrodynamic drag required for detachment. Moreover, colloid sorption is favored at surface sections with high density of small protrusions (density (D) = 2.6 ± 0.55 μm(-1), asperity diameter (φ) = 0.6 ± 0.2 μm, height (h) = 0.4 ± 0.1 μm) in contrast to surface sections with larger asperities and lower asperity density (D = 1.2 ± 0.6 μm(-1), φ = 1.4 ± 0.4 μm, h = 0.6 ± 0.2 μm). The study elucidates the importance to include surface roughness parameters into predictive colloid-borne contaminant migration calculations.

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Observation of aqueous Cm(III)/Eu(III) and UO22+ nanoparticulates at concentrations approaching solubility limit by laser-induced fluorescence spectroscopy

Cited by 6 publications

References 24 publications

Crystallographic and Spectroscopic Characterization of Americium Complexes Containing the Bis[(phosphino)methyl]pyridine-1-oxide (NOPOPO) Ligand Platform

Crystallographic and Spectroscopic Characterization of Americium Complexes Containing the Bis[(phosphino)methyl]pyridine-1-oxide (NOPOPO) Ligand Platform

Thermodynamic data provided through the FUNMIG project: Analyses and prospective

Site-Specific Retention of Colloids at Rough Rock Surfaces

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