Spectroscopic and electrochemical studies of selected lanthanides and actinides in concentrated aqueous carbonate and carbonate-hydroxide solutions and in molten dimethyl sulfone
Electrochemical and spectroscopic studies of neptunium, plutonium, americium, californium, and terbium in concentrated aqueous carbonate and carbonate-hydroxide solutions have been carried out. Changes in the absorption spectra of Np(VII), Np(V), Pu(VI), Pu(V), Am(VI), and Am(V) in concentrated Na/sub 2/CO/sub 3/ solution and in the formal potentials of the Np(VI)/Np(V) and Pu(VI)/Pu(V) couples as a function of pH were observed. The redox properties of Cf(III) in Na/sub 2/CO/sub 3/ and K/sub 2/CO/sub 3/ solutions at pH values from 8 to 14 were investigated. Californium(III) in bicarbonate-carbonate-hydroxide solution could not be oxidized to Cf(IV) chemically or electrochemically. The oxidation of terbium(III) in K/sub 2/CO/sub 3/-KOH solution was studied. The concentrations of terbium, carbonate, and hydroxide ions for generation and stabilization of Tb(IV) are critical. Redox titrations of Tb(IV) with Fe(CN)/sub 6//sup 4 -/ ion and analysis of Tb(IV) precipitates indicate that the Tb(IV) complex in solution is clustered in nature. Spectroscopic and electrochemical studies of cerium, samarium, europium, ytterbium, uranium, neptunium, plutonium, and americium in molten dimethyl sulfone (DMSO/sub 2/) at 400 K were performed. Differences in the DMSO/sub 2/ solution absorption spectra of trivalent Sm, Eu, and Yb and divalent Eu compared with those in aqueous solution were observed.
- Research Organization:
- Tennessee Univ., Knoxville (USA)
- OSTI ID:
- 6436401
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMERICIUM COMPOUNDS
ABSORPTION SPECTROSCOPY
ELECTROCHEMISTRY
CALIFORNIUM COMPOUNDS
CERIUM COMPOUNDS
EUROPIUM COMPOUNDS
NEPTUNIUM COMPOUNDS
PLUTONIUM COMPOUNDS
SAMARIUM COMPOUNDS
TERBIUM COMPOUNDS
YTTERBIUM COMPOUNDS
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LIGANDS
ORGANIC SULFUR COMPOUNDS
PH VALUE
POTASSIUM CARBONATES
POTASSIUM HYDROXIDES
SODIUM CARBONATES
SOLVENT PROPERTIES
VIBRATIONAL STATES
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHEMISTRY
DATA
ENERGY LEVELS
EXCITED STATES
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
RARE EARTH COMPOUNDS
SODIUM COMPOUNDS
SPECTROSCOPY
TRANSPLUTONIUM COMPOUNDS
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