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Determination of elemental sulphur in coal by supercritical fluid extraction and gas chromatography with atomic emission detection

✍ Scribed by Peter K.K. Louie; Ronald C. Timpe; Steven B. Hawthorne; David J. Miller

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
847 KB
Volume
72
Category
Article
ISSN
0016-2361

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✦ Synopsis

A rapid and reproducible method to quantify elemental sulphur in coal has been developed using supercritical fluid extraction (s.f.e.) and gas chromatography with atomic emission detection (g.c./a.e.d.). Quantitative spike recoveries of elemental sulphur were obtained from both sand (97+6%) and pre-extracted coal (96 + 3%). The total amount of elemental sulphur removed was found to be independent of the coal particle size, which indicates that elemental sulphur in coal is located at the surface of the coal particles. North Dakota (Beulah) lignite, Alaska (Beluga) subbituminous coal, and Illinois Basin bituminous coal samples contained elemental sulphur in the range of 2-3500 pg S, g-' coal. As much as 35.7% of the 'organic' sulphur in coal (as determined in accordance with ASTM guidelines) is, in fact, elemental sulphur rather than true organic sulphur. In addition, the elemental sulphur values for the coals used in this study correlate well with the inorganic sulphur fractions of coal but not with ASTM-defined 'organic' sulphur.

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