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Studies of elemental distributions within discrete coal macerals: Use of secondary ion mass spectrometry and X-ray photoelectron spectroscopy |
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| Authors: | NStewart Mclntyre Ronald R Martin William J Chauvin CGordon Winder James R Brown JAnthony MacPhee |
| Affiliation: | a Surface Science Western, Faculty of Science, University of Western Ontario, London, Ontario, Canada, N6G 3K7 * Department of Chemistry and University of Western Ontario, London, Ontario, Canada, N6G 3K7 ? Department of Geology, University of Western Ontario, London, Ontario, Canada, N6G 3K7 ** Energy Research Laboratory, CANMET, Energy, Mines & Resources Canada, Ottawa, Ontario, Canada K1A OG1 |
| Abstract: | Secondary ion mass spectrometry has been used to measure qualitatively the distributions of many trace and minor elements within some well-characterized coal macerals: vitrinite, fusinite and exinite. Complementary information was obtained by using X-ray photoelectron spectroscopy. Within the vitrinite specimens studied, a widely-dispersed largely inorganic aluminosilicate phase was identified, which contained a number of other trace elements. By contrast, within the organic-rich phase of this macerai, titanium was detected in a very even distribution; this suggests that some titanium may be bonded in an organic complex. The fusinite was shown to contain elevated concentrations of calcium, magnesium and fluorine, dispersed over a large portion of the maceral. The high fluorine content could be identified as an organo-fluoro compound using XPS. Exinite was found to contain lower concentrations of most elements, compared to other macerals. The organic composition of this maceral was significantly different from that of surrounding macerals; this could be seen from the enhanced emission of the C2H2-secondary ion and images of this ion thus clearly outlined the position of such macerals. |
| Keywords: | coal macerals instrumental methods of analysis |
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