Abstract
A new method for the determination of trace rare earth impurities in high-purity La2O3 by HPLC combined with ICP-MS is proposed. The chromatographic retention behavior of La and Ce in HPLC was studied with 2-ethylhexyl-hydrogen-2-ethylhexylphosphonate (P507) resin as the stationary phase and inorganic acid (HNO3) as the mobile phase. The effects of acidity of the mobile phase, flow rate of eluent and column oven temperature on the separation of La and Ce were investigated in detail. The results of the effect of different ratios of La / Ce showed that a favorable separation of La and Ce could be obtained easily and rapidly with the method presented. Compared with the conventional open column method, the proposed separation system shows a good performance with regard to short separation time, low reagent consumption, and simple operation. The method has been applied to the analysis of real samples of high-purity La2O3 with satisfactory results.
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Received: 8 September 1999 / Revised: 5 January 2000 / Accepted: 7 January 2000
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Qin, S., Jiang, Z., Hu, B. et al. HPLC combined with ICP-MS for the determination of trace amounts of rare earth impurities in high-purity La2O3 by using 2-ethylhexyl hydrogen-2-ethylhexylphosphonate resin as a stationary phase. Fresenius J Anal Chem 367, 250–253 (2000). https://doi.org/10.1007/s002160000334
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DOI: https://doi.org/10.1007/s002160000334