On the geochemistry of indium in coal-forming process

Details On the geochemistry of indium in coal-forming process On the geochemistry of indium in coal-forming process

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1023e&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 7, pp.1023-1027

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Scientific paper

The content and distribution of In in 168 samples from 7 coal deposits in Bulgaria were studied, using a spectrochemical method with a detection limit of 0.002 ppm. Indium is present in all samples, its content varying from 0.002 to 0.167 ppm in the coal and from 0.005 to 0.57 ppm in the ash. The mean contents for individual deposits do not differ statistically, and for all the deposits the In concentration (ppm) can be expressed generally by the equation In = 0.00068 A (A is the coal ash content in %). Of the petrographic constituents of coal, vitrain, xylene and liptain are enriched in In. In is associated with both the organic and with the inorganic matter of the coal. Inorganic matter and clay minerals in particular, act only as carriers of Indium. In contrast, organic matter concentrates In only to a small degree relative to other trace elements.

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