VERIFICATION OF THE LINEAR RELATIONSHIP BETWEEN CARBON AROMATICITIES AND H C RATIOS FOR BITUMINOUS COALS/

Carbon aromaticities for a further 15 bituminous coal samples, includi ng vitrinite and semi-fusinite maceral concentrates, have been obtaine d by solid state C-13 NMR using the quantitative single-pulse excitati on (SPE) technique, to add to the results for samples reported previou sly (Fuel, 1994, 73, 1926). A virtually identical linear correlation b etween the aromaticity (values in the range 0.73-0.91) and atomic WC r atio holds for the new samples investigated, confirming that it is ind ependent of both inertinite content and geological provincialism. (C) 1998 Elsevier Science Ltd. All rights reserved.