Abstract
The determination of uranium in liquid samples using energy dispersive X-ray fluorescence was investigated. The organic phase di-(2-ethyl hexyl) phosphoric acid and trioctyl phosphine oxide (D2EHPA-TOPO)/kerosene, which resulted from first and second cycles of uranium extraction from commercial phosphoric acid, was directly analyzed using 109Cd as a primary excitation source. Copper was used as an internal standard, which led to a linear relation between relative intensity of uranium and its concentration. Three calibration curves, 0–100, 100–1000 and 1000–6500 μg· ml−1, according to uranium concentration in the studied samples, were constructed. The effect of different molarities of D2EHPA and TOPO was considered. The detection limit, precision and accuracy were 1.1 μg · ml−1, 3% and 1.4%, respectively. The obtained results were compared with other techniques such as γ-ray spectroscopy, UV spectrometry and volumetry.
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Stas, J., Al-Merey, R. & Karjou, J. Direct Determination of Uranium in the D2EHPA-TOPO Organic Phase Using EDXRF Spectrometry. Journal of Radioanalytical and Nuclear Chemistry 250, 525–529 (2001). https://doi.org/10.1023/A:1017909424598
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DOI: https://doi.org/10.1023/A:1017909424598