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Two methods are described for the preparation of GeF(4) from Ge and Ge0(2) for isotopic measurements: a direct reaction with elemental fluorine and a wet chemical procedure. Germanium isotope amount ratios were obtained using the same measurement procedures as developed in the framework of the redetermination of the Avogadro constant and taking all significant sources of uncertainty into account.

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Authors: KIPPHARDT H, IRMM, JRC-Geel (BE);VALKIERS S, IRMM, JRC-Geel (BE);HENRIKSON F, IRMM, JRC-Geel (BE);DE BIEVRE P, IRMM, JRC-Geel (BE);TAYLOR P D P, IRMM, JRC-Geel (BE);TOLG G, Institut fur Spektrochemie und angewandte Spektoscopie, Dortmund (DE)
Bibliographic Reference: Article: International Journal of Mass Spectrometry, 189 (1999), 27-37
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