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Uranium
Items for "Uranium"
Effects of phosphate and ionic strength upon uranium(VI) sorption onto alumina as a function of pH
The sorption edges and the sorption isotherms of UO22+ onto alumina were determined by a batch technique in the presence and absence of phosphate at pH range 3–6, ionic strength range 0.05–0.5 mol/L and UO22+ concentrations 10-5–10-4 mol/L...
Keywords: Uranium, Sorption, Alumina, Phosphate, Ionic strength
04/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagDistribution studies on Th(IV), U(VI) and Pu(IV) using tri-n-butylphosphate and N,N-dialkyl amides
Distribution studies on U, Pu and Th have been carried out employing tri-n-butyl phosphate (TBP) as extractant to optimise the conditions for the reprocessing of spent fuel of proposed Th based Advanced Heavy Water Reactor (AHWR)...
Keywords: Uranium, Thorium, Plutonium, Amide, TBP
04/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSynthesis, characterization and structural refinement of polycrystalline uranium substituted zirconolite CaZr0.9U0.1Ti2O7
Ceramic precursors of Zirconolite (CaZrTi2O7) family have a remarkable property of substitution on Zr4+ cationic sites...
Keywords: Uranium, Zirconolite, Ceramic, Rietveld, Crystallography
06/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagStudies on some divalent metal α-isosaccharinic acid complexes
The presence of organic complexants, such as α-isosaccharinic acid (ISA) in an intermediate-level radioactive-waste (ILW) repository may have a detrimental effect on the sorption of radionuclides by forming organic complexes in solution...
Keywords: ISA, Cadmium, Uranium, Cobalt, Stability constants
06/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagElectrochemical behavior of uranium(VI) in 1-butyl-3-methylimidazolium chloride and in 0.05 M aliquat-336/chloroform
Alkali metal uranyl chloride (M2UO2Cl4 (M = Na or Cs)) was dissolved in 1-butyl-3-methylimidazolium chloride (bmimCl) and the redox behavior of uranyl ion present in the resultant solution was investigated by cyclic voltammetry at 343 K...
Keywords: Room temperature molten salts, Uranium, Electrodeposition, Cyclic voltammetry, Extraction
08/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagCollection/concentration of trace uranium for spectrophotometric detection using activated carbon and first-derivative spectrophotometry
The need exists for preconcentration of trace and ultratrace amounts of uranium from environmental, geological and biological samples...
Keywords: Preconcentration, Uranium, Activated carbon, First-derivative, Spectrophotometry
01/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagInteraction mechanisms of bacterial strains isolated from extreme habitats with uranium
This paper summarizes the effect of pH on the speciation and cellular localization of uranium bound by bacterial strains isolated from the S15 deep-well montoring site, located at the Siberian radioactive subsurface depository Tomsk-7, Russia...
Keywords: Bacterial isolates, Uranium, Interaction mechanisms, pH, EXAFS
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagUranium(VI) interaction with pyrite (FeS2): Chemical and spectroscopic studies
The mechanism of uranium(VI) interaction with pyrite was studied by solution chemistry and X-ray Photoelectron Spectroscopy (XPS)...
Keywords: Uranium, Pyrite, Redox reaction, Interaction, Spectroscopy
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagComplex formation of U(VI) with the amino acid L-threonine and the corresponding phosphate ester O-phospho-L-threonine
The complex formation of uranium(VI) with L-threonine and O-phospho-L-threonine was studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS)...
Keywords: Uranium, Complexation, Amino acid, TRLFS
12/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagProperties of U(VI)/U(IV) and Fe(III)/Fe(II) pairs and equilibrium U(VI)+2Fe(II)↔U(IV)+2Fe(III) in solutions of unsaturated heteropolytungstates K10P2W17O61 and K8SiW11O39
The unsaturated phosphotungstate K10P2W17O61 and silicotungstate K8SiW11O39 are strong and selective complexants of An(IV) in aqueous solution...
Keywords: Uranium, Iron, Heteropolyanion, Redox
04/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagMetal extraction by N,N′-dialkyl-N,N′-diaryl-dipicolinamides from nitric acid solutions
A study of americium, uranium and europium extraction by various dialkyl-diarylamides of 2,6-pyridine-dicarboxylic (dipicolinic) acid has shown that maximum extractability is achieved by using polar fluorine-substituted diluents...
Keywords: Dialkyl-diarylamides of 2,6-pyridine-dicarboxylic (dipicolinic) acid, Extraction, Americum, Uranium, Europium
04/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSorption of uranyl(VI) cations on suspended silicate: effects of N-donor ligands, carboxylic acids, organic cosolvents, and metal ions
Sorption of uranyl ion, UO22+, on silicate particles (3.00 g/L) was studied in sodium perchlorate solution as a function of pcH and ionic strength at 298 K...
Keywords: Uranium, Sorption, Silicate, Ternary complex, Carboxylic acids
05/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagPreparation of spherical, dense uranium fuel kernels with carbon
The internal gelation process and a suitable broth formulation with an uranium concentration of 1.3 M was used to produce air-dried uranium trioxide dihydrate (UO3·2H2O) and carbon microspheres with crush strengths greater than 600 g per microsphere...
Keywords: Uranium, Carbon, Internal gelation, Nuclear fuel
04/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSurface complexation modeling of the effects of phosphate on uranium(VI) adsorption
Previous published data for the adsorption of U(VI) and/or phosphate onto amorphous Fe(III) oxides (hydrous ferric oxide, HFO) and crystalline Fe(III) oxides (goethite) was examined...
Keywords: Uranium, Phosphate, Iron Oxides, Adsorption, modeling
05/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSynthesis and characterization of the solid uranium(VI) dioxo-diacetohydroxamate complex
A novel dry synthesis for the uranium(VI) dioxo-diacetohydroxamate (UAHA) complex has been developed...
Keywords: UREX, Acetohydroxamic acid, Uranium, NMR, XAFS
08/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSpent fuel UO2 matrix alteration in aqueous media under oxidizing conditions
The effects of αβγ radiolysis of water on oxidation and dissolution of the UO2 matrix of spent fuel were investigated in aerated media...
Keywords: UOX spent fuel, Leaching, Uranium, Radiolysis, Surface reactivity
09/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagKinetics and thermodynamics of uranium(VI) sorption on hydrous silica
Sorption of uranyl ion, UO22+, on SiO2· x H2O (silica gel) has been investigated as a function of time, amount of silica gel (0.10–0.60 g), uranium concentration (5.00×10-5–1.00×-3 M), ionic strength (0.20–1.40 M NaClO4), pH (∼2.0–6.0), and temperature (283–333 K)...
Keywords: Kinetics, Thermodynamics, Uranium, Sorption, Silica
09/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSeparation of actinides from fission products by extraction chromatography prior to X-ray fluorescence measurement for analytical control of a PUREX test
Five separation methods by Eichrom column extraction chromatography were developed and implemented for performance control of a PUREX (Plutonium, Uranium Refining by EXtraction) test...
Keywords: Extraction chromatography, UTEVA®, X-ray fluorescence, Uranium, Plutonium
11/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagKinetics and electrochemical studies of uranium in acetate and formate media by cyclic voltammetry
The cyclic voltammetric behavior of uranyl ion was investigated at hanging mercury drop electrode in perchlorate supporting electrolyte...
Keywords: Uranium, Acetate, Formate, Kinetics, Thermodynamics
12/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagLiquid–liquid extraction of uranium from nitric acid solution using di-n-butylsulfoxide in petroleum ether as extractant
A simple, efficient and economical liquid–liquid extraction method has been developed for quantitative extraction of uranium from 2 M HNO3 using di-n-butyl sulfoxide in petroleum ether...
Keywords: Uranium, Extraction, Dibutylsulfoxide, Petroleum ether, Nitric acid
01/2008 | Radiochimica Acta, Oldenbourg WissenschaftsverlagTemperature effects on the interaction mechanisms between U(VI) and Eu(III) and ZrP2O7: experiment and modelling
In the field of nuclear waste management, prediction of the radionuclides migration through the geosphere has to take into account the effects of temperature...
Keywords: Sorption, Uranium, Europium, Zirconium diphosphate, temperature
01/2008 | Radiochimica Acta, Oldenbourg WissenschaftsverlagSpeciation of An(IV) (Pu, Np, U and Th) in citrate media
The acquisition of additional data concerning actinide decorporation is planned under the French nuclear and environmental toxicology program.
Citric acid is a fundamental biological constituent found at relatively high concentrations in blood plasma and is involved in many biological processes.
Spectrophotometry was the primary method used to determine the speciation of An(IV)-citrate systems (Th, U, Np, Pu)...
Keywords: Plutonium, Neptunium, Uranium, Thorium, Citric acid
03/2008 | Radiochimica Acta, Oldenbourg Wissenschaftsverlag