Abstract
The standard hydrochloric/hydrofluoric acid treatment used to remove most minerals in kerogen preparation often leaves abundant pyrite. This pyrite is a major obstacle to establishing elemental composition and functional group distributions in kerogen by both chemical and spectroscopic techniques. Quantitative pyrite removal by other conventional means such as nitric acid, lithium aluminum hydride, and sodium borohydride has not been possible without objectionable alterations of the organic matter. Experiments reported here demonstrate that acidic chromous chloride reduction can remove pyrite quantitatively without causing significant alteration of the organic matter
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