Volumetric determination of U/O ratio in sintered pellets of UO/sub 2+x/ and UO/sub 2+x/.ThO$sub 2$

Technical Report · Sun Oct 01 04:00:00 EDT 1972

OSTI ID:4365389

Federgrun, L; Abrao, A

A technique for the O/U ratio determination in UO/sub 2+x and UO/sub 2+x/ ThO/sub 2/ sintered pellets is outlined. Tetravalent uranium and total uranium are determined by titration after dissolution with phosphoric acid, with the aid of CO/sub 2 during the titration, avoiding the oxidation of reduced uranium. The difficulties concerning the dissolution of the ceramic-grade oxides are overcome satisfactorily, especially for those oxides containing thorium. The titration of uranium lV in the presence of thorium is run with potassium permanganate, overcoming the difficulties found when the titration is tried with potassium dichromate. The thorium effect during the uranium titration is studied. The O/U ratio is calculated after the determination of total uranium and uranium IV, the content of uranium VI being calculated by difference. (auth)

• Research Organization: Instituto de Energia Atomica, Sao Paulo (Brazil)
• NSA Number: NSA-29-013068
• OSTI ID: 4365389
• Report Number(s): IEA--276
• Country of Publication: Brazil
• Language: Portuguese

Related Subjects

*THORIUM OXIDES-- QUANTITATIVE CHEMICAL ANALYSIS
*URANIUM DIOXIDE-- QUANTITATIVE CHEMICAL ANALYSIS
ABUNDANCE
CHEMICAL COMPOSITION
CHROMATES
DISSOLUTION
FUEL PELLETS
MANGANATES
METALS
N40100 --Chemistry--Analytical & Separations Chemistry
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
OXIDES
POTASSIUM COMPOUNDS
STOICHIOMETRY
TITRATION