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Trace element determination in high-purity scandium by neutron activation analysis and pre-irradiation matrix separation

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Abstract

A pre-irradiation separation procedure has been developed for the determination of trace elements in high-purity scandium by neutron activation analysis. The sample is dissolved in high-purity concentrated hydrochloric acid and scandium is extracted with the same volume of a solution of 50 vol.% bis(2-ethyl hexyl)-orthophosphoric acid (HDEHP) in toluene. The scandium matrix is removed from the most important trace impurities and the residual amount of Sc is in the range of 0.001%. The separation is carried out in the vial to be used in irradiation to prevent sample contamination. Detection limits in the ppb range were achieved with a sample of 10 mg, a thermal neutron flux of 2 · 1013 n · cm−2 · s−1 and an irradiation time of 48 hours. Most of the elements sought in two samples of high-purity scandium were below the detection limits.

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Authors and Affiliations

  1. Research Center Jülich (KFA), Central Department of Analytical Chemistry (ZCH), D-52425, Jülich, Germany

    G. Küppers & G. Erdtmann

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  1. G. Küppers
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  2. G. Erdtmann
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Küppers, G., Erdtmann, G. Trace element determination in high-purity scandium by neutron activation analysis and pre-irradiation matrix separation. Journal of Radioanalytical and Nuclear Chemistry, Articles 189, 183–190 (1995). https://doi.org/10.1007/BF02042597

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  • DOI: https://doi.org/10.1007/BF02042597

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