Spectroscopic and electrochemical studies of selected lanthanides and actinides in concentrated aqueous carbonate and carbonate-hydroxide solutions and in molten dimethyl sulfone

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6436401

Varlashkin, P G

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
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ABSORPTION SPECTROSCOPY
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
AMERICIUM COMPOUNDS
CALIFORNIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CERIUM COMPOUNDS
CHEMISTRY
DATA
ELECTROCHEMISTRY
ENERGY LEVELS
EUROPIUM COMPOUNDS
EXCITED STATES
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
LIGANDS
NEPTUNIUM COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PLUTONIUM COMPOUNDS
POTASSIUM CARBONATES
POTASSIUM COMPOUNDS
POTASSIUM HYDROXIDES
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SODIUM CARBONATES
SODIUM COMPOUNDS
SOLVENT PROPERTIES
SPECTROSCOPY
TERBIUM COMPOUNDS
TRANSPLUTONIUM COMPOUNDS
TRANSURANIUM COMPOUNDS
VIBRATIONAL STATES
YTTERBIUM COMPOUNDS