Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.1899v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 10, pp.1899-1908
Physics
Scientific paper
The functional groups of brown coal lithotypes, their humic acids and kerogens were investigated by elemental analysis and quantitative infrared spectroscopy using absorption coefficients. An inverse relationship is reported between the concentrations of kerogen and humic acids for each lithotype and significant variation in the levels of humic acids with lithotype are attributed to changing higher plant input and depositional environments. The structural implications of observed trends in absorption coefficients and their usefulness as a rapid method of functional group analysis has been investigated. Using this infrared technique, kerogen structures as reflected in functional group analyses were found to exhibit a dependance on lithotype, although no significant variation in the functionality of the humic acid structures was observed.
Johns Bethany R.
Verheyen T. V.
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