Determination of trace quantities of thorium in uranyl nitrate by x-ray emission spectrometry

Technical Report · Mon Oct 01 04:00:00 EDT 1973

DOI:https://doi.org/10.2172/4345111· OSTI ID:4345111

Winters, W. I.

Trace quantities of thorium in uranium were separated by precipitating thorium fluoride from a 1.0M HF-1.0M NH/sub 4/F matrix using yttrium as an internal standard and lanthanum as a carrier. The thorium precipitate was collected on a filter and analyzed by x-ray emission spectrometry. The method has a detection limit of about 15 mu g thorium per gram of uranium. The relative accuracy and precision at the 120- mu g thorium level was 95.5 plus or minus 1.5%. Studies on the rate of precipitation, sample size limitations, and the effect of varying molar fluoride-touranium ratios are discussed. The effects of potentially interfering anions, cations, and acids, which are commonly found in uranium system or form insoluble fluorides were studied. Radioactive tracer studies using /sup 234/Thh and /sup 88/Y were carried out at different levels of thorium and uranium to determine the absolute efficiency of the precipitation. The speed, selectivity, and precision of this x-ray method make it an excellent alternative to spectrophotometric methods. (auth)

• Research Organization: Atlantic Richfield Hanford Co., Richland, Wash. (USA)
• NSA Number: NSA-29-015306
• OSTI ID: 4345111
• Report Number(s): ARH--2913
• Country of Publication: United States
• Language: English

Related Subjects

*THORIUM-- X-RAY SPECTROSCOPY
*URANIUM-- X-RAY SPECTROSCOPY
ACCURACY
EMISSION SPECTROSCOPY
N40130* --Chemistry--Analytical & Separations Chemistry-- Radiometric & Radiochemical Procedures
PRECIPITATION
QUANTITATIVE CHEMICAL ANALYSIS
SENSITIVITY
TRACE AMOUNTS
URANYL NITRATES