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Determination of tungsten in ores, concentrates and plant process materials using internal standard X‐ray fluorescence spectrophotometry
Author(s) -
Harris A. M.,
Hingle D. N.
Publication year - 1979
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300080310
Subject(s) - tungsten , tantalum pentoxide , tantalum , materials science , gravimetric analysis , analytical chemistry (journal) , tungsten trioxide , barium , x ray fluorescence , fluorescence , metallurgy , chemistry , chromatography , optics , physics , organic chemistry
A method is described for the X‐ray fluorescence determination of tungsten in non‐metallic samples over the range 0–100%. The sample is fused with (65% sodium, 35% lithium) tetraborate, barium nitrate and tantalum pentoxide, the internal standard, at 1200°C and the melt cast into a platinum/5% gold mould. After cooling the cast bead, the tungsten and tantalum Lα intensities are determined by X‐ray fluorescence. The tungsten content of the sample is found by comparing the measured intensity ratio with intensity ratios obtained from standards prepared using pure tungsten trioxide. A wide range of ores, concentrates and plant process materials are analysed for tungsten by this method. The accuracy and precision of the method, which is quicker and requires less skill from the analyst, are found to be superior to those of the classical gravimetric method.