Redox speciation method for neptunium in a wide range of concentrations
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Summary
The adsorption method for determination of the distribution of neptunium among its oxidation states by the use of solvent impregnated resins and bismuth phosphate precipitates as adsorbents is described. For neptunium in concentration ranging from ∼10-10 to ∼10-2.5M, Np(IV) and Np(VI) were quantitatively adsorbed on the impregnated resin in a solution of the acidity 1.0-0.1M HClO4, while Np(V) remained in the liquid phase. In the same condition, the precipitate of bismuth phosphate absorbed Np(IV) selectively, leaving Np(V) and Np(VI) in the liquid phase. By carrying out these adsorption methods in Ultrafree-MC Microporous Centrifugal Filter Units (Millipore Corporation), the oxidation state distribution of neptunium in acid solution can be determined in a simple manner with a small sample volume (500μl) regardless of its concentration.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- Cross section measurements using gas and solid targets for production of the positron-emitting radionuclide O-14
- Redox speciation method for neptunium in a wide range of concentrations
- Complete removal of uranyl nitrate from tissue matrix using supercritical fluid extraction
- Solubility of thorium from Th3UO8 and ZrTh3UO10 ceramics
- Chemistry of rhenium as an analogue of technetium: Experimental studies of the dissolution of rhenium oxides in aqueous solutions
- Multitracer studies on the permeation of rare earth elements through a supported liquid membrane containing 2-ethylhexyl phosphonic acid-2-ethylhexyl ester (EHEHPA)
- Adsorption of barium on kaolinite, illite and montmorillonite at various ionic strengths
- Development of selective cobalt and cesium removal from the evaporator concentrates of the PWR Paks
- Complexation of Ni(II) by α-isosaccharinic acid and gluconic acid from pH 7 to pH 13
- Radiosynthesis of 3-{[4-(4-[18F]fluorobenzyl)]piperazin-1-yl}methyl-1H-pyrrolo[2,3-b]pyridine: A potential dopamine D4 receptor imaging agent
