Structural relationships between a brown coal and its kerogen and humic acid fractions |
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| Authors: | TV Verheyen AG Pandolfo RB Johns |
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| Institution: | Department of Organic Chemistry, University of Melbourne, Parkville, Victoria 3052, Australia |
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| Abstract: | A South Australian Tertiary brown coal is fractionated into humic acid and kerogen fractions. These related samples are then subjected to a number of different analytical techniques including infrared and13C-Nuclear Magnetic Resonance spectroscopies and pertrifluoroacetic acid oxidation. Structural conclusions are drawn from an integrated consideration of the data. Brown coal aliphatic structure is concentrated in the kerogen and the solvent soluble polar acid fractions. The humic acids are the most aromatic and contain a high degree of hydrogen bonding. Only very minor amounts of long polymethylene chain structures are observed in the humic acids, in complete contrast to the kerogen fraction. Different organic detrital origins are proposed for the coal fractions. |
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| Keywords: | brown coal humic acid kerogen peroxytrifluoroacetic acid oxidation infra-red |
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