Rapid determination of tungsten in alloys, ores and concentrates by atomic absorption spectrometry

Geological and inorganic materials

“…Samples were presented to the instrument in a polypropylene cup fitted with a polypropylene window and run in a He atmosphere using a Cr tube at 50 kV, 50 mA, with a LiF crystal. LLD for Fe at the 3a level was 9 Mg/g. while that for V was 6 Mg/g-In addition to the evaluation of the economic constituents of materials, XRF is also being used to evaluate the presence and amount of contaminants and matrix composition of raw materials and byproducts.…”

“…Methods of analysis for ore-grade material and concentrates were reported for W and Sn. Raoot et al (9) determined W by FAAS. In their method, the sample was fused with Na2C03 and W was separated from iron by precipitation.…”

“…Concentrations were determined from sensitivity factors, relative to a major element, obtained from a standard. The detection limit for all REE were <1 /xg/g and the analyzed areas were [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] /xm in diameter. MacRae and Metson (359) used the SIMS technique to determine the REE.…”