Determination of uranium in uranium metal, uranium oxides, and uranyl nitrate solutions by potentiometric titration

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5924813

Tucker, H L; McElhaney, R J

A simple, fast method for the determination of uranium in uranium metal, uranium oxides, and uranyl nitrate solutions has been adapted from the Davies-Gray volumetric method to meet the needs of Y-12. One-gram duplicate aliquots of uranium metal or uranium oxide are dissolved in 1:1 HNO/sub 3/ and concentrated H/sub 2/SO/sub 4/ to sulfur trioxide fumes, and then diluted to 100-mL volume. Duplicate aliquots are then weighed for analysis. For uranyl nitrate samples, duplicate aliquots containing between 50 and 150 mg of U are weighed and analyzed directly. The weighed aliquot is transferred to a Berzelius beaker; 1.5 M sulfamic acid is added, followed in order by concentrated phosphoric acid, 1 M ferrous sulfate, and (after a 30-second interval) the oxidizing reagent. After a timed 3-minute waiting period, 100 mL of the 0.1% vanadyl sulfate-sulfuric acid mixture is added. The sample is then titrated past its endpoint with standard potassium dichromate, and the endpoint is determined by second derivative techniques on a mV/weight basis.

• Research Organization: Oak Ridge Y-12 Plant, TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5924813
• Report Number(s): Y/DK-345; CONF-830589-2; ON: DE83013565
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ACTINIDE COMPOUNDS
ACTINIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
ELEMENTS
METALS
NITRATES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POTENTIOMETRY
QUANTITATIVE CHEMICAL ANALYSIS
TITRATION
URANIUM
URANIUM COMPOUNDS
URANIUM OXIDES
URANYL COMPOUNDS
URANYL NITRATES