Trace element determination in high-purity scandium by neutron activation analysis and pre-irradiation matrix separation |
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Authors: | G Küppers G Erdtmann |
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Institution: | (1) Research Center Jülich (KFA), Central Department of Analytical Chemistry (ZCH), D-52425 Jülich, Germany |
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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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