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  • Author or Editor: R. Al-Merey x
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Abstract  

Rare earth elements have been determined in Syrian phosphate rocks by two methods: inductively coupled plasma atomic emission spectrometry following a cation separation, and instrumental neutron activation analysis using both short and long irradiation periods. The results from the two methods agree in most cases apart from Ce, Lu, Nd and Sm. Despite the absence of reliable reference materials, we believe the emission spectrometry technique to be the more accurate.

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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 g· 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 g · ml–1, 3% and 1.4%, respectively. The obtained results were compared with other techniques such as -ray spectroscopy, UV spectrometry and volumetry.

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