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

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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 ... continued below

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Pages: 32

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Winters, W.I. October 1, 1973.

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Description

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)

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Pages: 32

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Dep. NTIS

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  • Other Information: Orig. Receipt Date: 30-JUN-74

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  • Report No.: ARH--2913
  • Grant Number: AT(45-1)-2130
  • DOI: 10.2172/4345111 | External Link
  • Office of Scientific & Technical Information Report Number: 4345111
  • Archival Resource Key: ark:/67531/metadc1021567

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  • October 1, 1973

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  • Oct. 15, 2017, 10:09 p.m.

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  • Jan. 23, 2018, 1:43 p.m.

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Winters, W.I. Determination of trace quantities of thorium in uranyl nitrate by x-ray emission spectrometry, report, October 1, 1973; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1021567/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.