Nickel porphyrins in the bedding planes of a Colorado lean oil shale |
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| Authors: | JF Branthaver LG Trudell RA Heppner |
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| Institution: | U.S. Department of Energy, Laramie Energy Technology Centre, P.O. Box 3395, University Station, Laramie, WY 82071, U.S.A. |
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| Abstract: | A Colorado lean oil shale was found to have red-colored material on the faces of bedding planes and fractures. This red material is almost entirely the nickel chelate of a single C-29 porphyrin of deoxophylloerythroetioporphyrin type. The molecular weight of the chelate is 490 or 492, depending on which of the two major isotopes of nickel is chelated. A small amount of a methylene homologue 14 mass units higher in molecular weight is also present. Porphyrins extracted from the powdered shale are an extended homologous series of deoxophylloerythroetioporphyrin-type and possibly etio-type nickel porphyrins, as determined by mass spectrometry. The origin of the red porphyrins coating the shale fractures and bedding planes therefore was exogenous to these particular shale samples. |
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