Spectrophotometric determination of nonstoichiometry in hyperstoichiometric uranium dioxide

Journal Article · Wed Oct 01 00:00:00 EDT 1986 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00125a027· OSTI ID:5369533

Ahmed, M K; Sreenivasan, N L

Uranium dioxide is widely used as a nuclear fuel and usually exists as hyperstoichiometric UO/sub 2+x/. In the described method UO/sub 2+x/ is dissolved in warm concentrated phosphoric acid saturated with sodium sulfate at room temperature to prevent the air oxidation of U(IV). The concentrations of U(VI) and U(IV) are directly determined by means of the absorbance of the two species at two specific wavelengths 420 and 665 nm, respectively. The results obtained are precise to +/- 0.002 O/U units and have been compared with those obtained from gravimetric titrimetry employing potentiometric end point detection. The O/U ratio determined by the two procedures agrees within 0.004 O/U units. The method has been employed to determine O/U ratio in near stoichiometric UO/sub 2/ (2.039) as well as in U/sub 3/O/sub 8/ (2.670). The developed spectrophotometric method is simple and fast and does not require inert atmosphere.

• Research Organization: Indira Gandhi Centre for Atomic Research, Kalpakkam, India
• OSTI ID: 5369533
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 58:12; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

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11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
ACTINIDE COMPOUNDS
ALKALI METAL COMPOUNDS
CHALCOGENIDES
DATA
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOSPHORIC ACID
SODIUM COMPOUNDS
SODIUM SULFATES
SPECTROPHOTOMETRY
STOICHIOMETRY
SULFATES
SULFUR COMPOUNDS
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES
VALENCE