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Polar fractions of three immature sulphur-rich sediments and four sulphur-rich oils, all of Miocene age, were studied using two selective chemolytic methods, namely methyl lithium/methyl iodide, which selectively cleaves polysulphide bonds, and Raney nickel or nickel boride which cleave both mono- and polysulphide bonds. In this way the amount of polysulphide-linked vs mono- and polysulphide-linked...
Polar fractions of sediment extracts and a crude oil were isolated and analyzed for low-molecular-weight (LMW) sulphoxides. Sediment extracts were found to contain relatively high amounts of sulphoxides as demonstrated by X-ray absorption analyses and chemical reduction of sulphoxides followed by the isolation of the formed LMW sulphides. The amounts of cyclic sulphoxides are comparable to the amounts...
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