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Determination of Trace Lithium in Uranium Compounds by Adsorption on Activated Alumina Using a Micro-column Method

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Abstract

A novel method using a micro-column packed with active alumina as solid phase was proposed for separation of trace lithium from uranium compounds prior to determination. The method is based on a preliminary chromatographic separation of the total amount of uranium. This separation involves passing the solution containing sodium carbonate through active alumina and then eluting the trace lithium retained by the solid phase with a solution of sulfuric acid. Two modes, off-line and on-line micro-column preconcentration, were performed. In conjunction with atomic absorption spectrometry, this on-line preconcentration technique allows a determination of lithium at 10-9 level. Both off-line and on-line mode operation conditions were investigated in separation and determination of trace lithium by micro-column method (length of column bed, flow rate, etc.). The adsorption capacity of activated alumina was found to be 343 µg g-1 for lithium. Under the optimal operation condition, the detection limit (DL) of on-line preconcentration corresponding to three times the standard deviation of the blank (S/N = 3) was found to be 1.3 ng mL-1 and the RSD of this method is 3.32% (n = 5). The on-line calibration graph was linear over the range 20 - 200 ng mL-1. A good preconcentration factor 820 was achieved by experiment under the on-line mode. The developed method was applied to the analysis of trace lithium in nuclear grade uranium compounds.

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Authors and Affiliations

  1. Applied Chemistry Department, East China Institute of Technology, JX 344000, Fu Zhou, China

    Ming-biao Luo, Bo-ping Li, Zhi Yang, Wei Liu & Yu-zhen Sun

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  1. Ming-biao Luo
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  2. Bo-ping Li
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  3. Zhi Yang
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  4. Wei Liu
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  5. Yu-zhen Sun
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Correspondence to Ming-biao Luo.

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Luo, Mb., Li, Bp., Yang, Z. et al. Determination of Trace Lithium in Uranium Compounds by Adsorption on Activated Alumina Using a Micro-column Method. ANAL. SCI. 24, 1013–1017 (2008). https://doi.org/10.2116/analsci.24.1013

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  • DOI: https://doi.org/10.2116/analsci.24.1013

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