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• W2029665676 endingPage "1647" @default.
• W2029665676 startingPage "1637" @default.
• W2029665676 abstract "A procedure has been developed for separate measurement and isotopic analysis of kerogen and elemental C (soot, charcoal) in sedimentary rocks. The carbonaceous residue left after HF-HCl dissolution is oxidized with 0.10 MCr2O7= in 2 MH2SO4 at 50°C. Kerogen reacts with a half-life of 6–180 hrs, depending on maturity, and thus can be quantitatively removed from elemental C, which reacts more slowly (t12 ≈ 600–2000 hr). The amount and isotopic composition of kerogen and elemental C are then obtained by measurement of etched and unetched samples, after applying a correction for the loss of elemental C in the etch. The rate of the oxidation reaction has been studied in detail for carbon black and for carbonaceous residues from 2 K-T boundary clays, and less extensively for 12 samples of charcoal and kerogen. Most materials obey first-order kinetics to a fair approximation, but carbon black and K-T soot—both consisting of spherules—show a sudden, 4.0 or 1.7-fold increase in the rate after a mass loss of 23 or 82%, respectively. Apparently the interiors of soot spherules are more reactive than the exteriors." @default.
• W2029665676 created "2016-06-24" @default.
• W2029665676 creator A5062971783 @default.
• W2029665676 creator A5069521693 @default.
• W2029665676 date "1989-07-01" @default.
• W2029665676 modified "2023-10-16" @default.
• W2029665676 title "Elemental carbon in sediments: Determination and isotopic analysis in the presence of kerogen" @default.
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• W2029665676 doi "https://doi.org/10.1016/0016-7037(89)90245-7" @default.
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