Solvent extractible and bound biomarker profile for low temperature coal tar were compared using the biomarker ratios obtained from the selective ion resolution for pristane, phytane, n-C17 and hopanesratios of GC-MS results, with a view to ascertaining whether or not the data for asphaltene-derived biomarker can be used for effective correlation studies, and if serious alterations arising from biodegradation and other environmental factors could affect the use of the solvent extractible ones. The pristane/phytane, pr/n-C17 ratios and carbon preference index are 4.0, 1.1 and 0.9, respectively for the free aliphatics and 4.2, 1.2 and 1.2 for the bound. These values are quite similar to each other. The hopanes are less mature for the bound than for the free, this is a general trend found for most hydropyrolysis products.
Key words: Biomarker, coal tar, asphaltene.
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