Precise simultaneous determination of zirconium and hafnium in silicate rocks,meteorites and lunar samples |
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Authors: | P A Kumar A N Garg W D Ehmann |
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Institution: | (1) Department of Chemistry, University of Kentucky, 40506 Lexington, Kentucky, USA;(2) Present address: Department of Chemistry, University of Udaipur, 313001 Udaipur, India;(3) Present address: International Paper Company, 10987 Tuxedo Park, New York |
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Abstract: | A precise, sensitive and rapid analytical technique has been developed for the simultaneous determination of Zr and Hf in
natural silicate matrices. The technique is based on radiochemical neutron activation analysis and employs a rapid fusion
dissolution of the sample and simultaneous precipitation of the Zr−Hf pair with p-hydroxybenzene arsonic acid in an acidic
medium. The indicator radionuclides,95Zr and181Hf, are counted with a pair of high resolution Ge(Li) detectors and the95Zr activity is corrected for the contribution from U fission. The chemical yields of the radiochemical separation are based
on Hf carrier, which quantitatively carries both Zr and Hf. The yield is determined by reactivation of the processed samples
and standards with a252Cf isotopic neutron source and by counting the 18.6 sec half-life179mHf. The sensitivity, precision and accuracy of the procedure are demonstrated by replicate analyses of several standard rocks,
meteorites and lunar samples which exhibit a wide range of Zr and Hf abundances. |
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