Abstract
A method for semipreparative liquid chromatographic separation of aromatic ring classes in crude oils and the organic extracts of rock and coal samples was developed. Partially deactivated microparticulate alumina was used as the stationary phase. Reproducible retentions could be achieved with a moisture-control system. Application of a stepwise gradient of dichloromethane in n-hexane resulted in four aromatic subfractions, which were characterized by using fused silica capillary column gas chromatography either with dual flame ionization and flame photometric detection or in combination with mass spectrometry. The complete separating time, including reconditioning of the column, was 40 minutes.
Published Version
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