Brt. Simoneit et al., COMPOSITION OF THE EXTRACT FROM A CARBONIFEROUS BITUMINOUS COAL .2. COMPOUND-SPECIFIC ISOTOPE ANALYSES, Fuel, 74(8), 1995, pp. 1194-1199
Hydrocarbon subfractions of a Carboniferous bituminous coal extract we
re subjected to compound-specific isotope analysis (CSIA). The carbon
isotope compositions of individual n-alkanes, isoprenoids, aromatic hy
drocarbons and triterpenoids were determined to provide supplementary
confirmation for the biomarker sources as deduced from their molecular
structures. The total bitumen extract has a delta(13)C value of - 25.
03 parts per thousand. The delta(13)C data for the biomarkers fit an o
rigin from higher plants with a minor contribution from microbial acti
vity.