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Neptunium
Items for "Neptunium"
Interaction of neptunium(V) with picolinic, nicotinic and isonicotinic acids
The interaction of Np(V) with all isomers of pyridinemonocarboxylic acid has been investigated, stability constants have been calculated using NIR spectroscopy...
Keywords: Neptunium, Crystal structure, Stability constant, Complexation, Spectrophotometry
02/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagProtonation of D-gluconate and its complexation with Np(V) in acidic to nearly neutral solutions
Thermodynamic properties of the protonation of D-gluconic acid (HGH4(aq)) and its complexation with Np(V) have been studied in acidic to nearly neutral solutions at t =25 °C and I=1 M NaClO4 by potentiometry, spectrophotometry and calorimetry...
Keywords: Gluconic acid, Neptunium, Complexation, Stability constant, Enthalpy
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagLeaching of neptunium from garnet- and murataite-based ceramics
Leach resistance of neptunium-doped garnet- and murataite-based ceramics with calculated compositions (in wt.%: 38 Fe2O3, 21 Gd2O3, 16 NpO2, 15 ZrO2, 10 CaO and 55 TiO2, 10 Mn2O3, 10 CaO, 10 NpO2, 5 ZrO2, 5 Al2O3, 5 Fe2O3 respectively was studied...
Keywords: Ceramic, Garnet, Leaching, Murataite, Neptunium
09/2006 | Radiochimica Acta, Oldenbourg WissenschaftsverlagDiffusive transport of neptunium and plutonium through compacted sand-bentonite mixtures under anaerobic conditions
Diffusive transport of neptunium, plutonium, tritiated water (HTO), Cs+ and I- in compacted sand-bentonite mixtures was studied by a through-diffusion method...
Keywords: diffusion, Neptunium, Plutonium, Bentonite, Effective diffusivity
02/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagStudy of Np speciation in citrate medium
In the framework of the French Environmental Nuclear Toxicology program, additional experiments related to the decorporation of actinides are planned...
Keywords: Neptunium, Citrate, Complexation, Redox speciation, Np(IV)
07/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagEffect of humic acid on sorption of neptunium on hematite colloids
Sorption of neptunium on hematite colloids has been studied at varying pH values (3–10) in absence and presence of humic acid using 239Np as a tracer...
Keywords: Neptunium, Humic acid, Hematite, Sorption, Speciation
09/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagCation–cation interaction in crystal structures of Np(V) and Pu(V) benzoate complexes with 2,2′-bipyridine, [NpO2(C10H8N2)(OOCC6H5)]2 and [PuO2(C10
Single crystals of the Np(V) and Pu(V) benzoate complexes with 2,2′-bipyridine were prepared. According to X-ray diffraction analysis data, they are isostructural neutral dimers with the [AnO2(C10H8N2)(OOCC6H5)]2 (An=Np or Pu) composition...
Keywords: Actinides, Neptunium, Plutonium, Benzoates, Bipyridine
09/2007 | Radiochimica Acta, Oldenbourg WissenschaftsverlagNeptunium(V) disproportionation and cation–cation interactions in TBP/kerosene solvent
In 30% TBP/OK Np(V) is unstable and disproportionates to Np(IV) and Np(VI). Np(V) readily coordinates to Np(IV) in solution to form a “cation–cation” complex by bonding through an axial oxo group on Np(V)...
Keywords: Neptunium, Disproportionation, Kinetics, TBP, Near IR electronic absorption spectroscopy
12/2007 | 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