University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Metal -> tungsten

Citations 1

"Online Coupling Of Ion Chromatography And Atomic Spectrometry And Use Of Direct Graphite-furnace Atomic Absorption Spectrometry As New Tools For Ultra Trace Determinations In Refractory Metals"
Microchim. Acta 1995 Volume 117, Issue 3-4 Pages 245-260
Andreas Seubert, Peter Wilhartitz, Robert Krismer and Hermann Krabichler

Abstract: he cited methods were designed to determine low or sub-ppb levels of impurities in metals like Mo and W. Samples were dissolved with use of H2O2 (cf., Fresenius J. Anal. Chem., 1993, 345, 547) and the solutions were applied to a TMC-1 column (25 mm x 3 mm i.d., Dionex) of a microporous cation exchanger. The peroxo-acids of the matrix were washed off and the retained cations were eluted with 4 or 6 M HNO3. Flow charts are illustrated for detection by ICP AES or ICP MS and operating parameters are tabulated. The methods were successfully applied to the determination of 28 elements in high-purity W, for which manufacturers analyzes by glow-discharge MS were available. There was reasonable agreement between the methods; detection limits are tabulated. The proposed methods were generally more sensitive and faster than glow-discharge MS. A similar pre-concentration step was also used for the determination of alkali metals by graphite-furnace AAS.
Metals, alkali HPIC Spectrophotometry