Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1637w&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, 1989, p. 1637-1647.
Physics
13
Carbon, Carbonaceous Materials, Chemical Bonds, Kerogen, Sedimentary Rocks, Cretaceous-Tertiary Boundary, Hydrogen Peroxide, Ph
Scientific paper
A procedure is described that makes it possible to separately measure and analyze isotopically two types of carbon in sedimentary rocks: the elemental carbon (charcoal, soot, metamorphic carbon) and kerogen. The procedure is based on oxidation of the sample dissolved in HF-HCl with 0.1 M K2Cr2O7 in 2 M H2SO4 at 50 C, upon which kerogen, which reacts with a half-life of 6-180 hrs, depending on maturity, can be quantitatively removed from elemental C, which reacts with half-life of 600-2000 hrs. The rate of the oxidation reaction was measured for carbon black and for carbonaceous residues from two K-T boundary clays, as well as for 12 samples of charcoal and kerogen. It was found that most materials obey first-order kinetics, but that carbon black and K-T soot (both consisting of spherules) show a sudden 1.7-fold increase in the rate after a mass loss of 23 or 82 percent, respectively, indicating that the interiors of soot spherules are more reactive than the exteriors.
Anders Edward
Wolbach Wendy S.
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