Separation of crude oil fractions by gel permeation chromatography

Polycyclic aromatic hydrocarbons in the environment. Isolation and characterization by chromatography, visible, ultraviolet, and mass spectrometry

“…Even in petroleum analysis, where large samples are available, a complete analytical resolution of the PAH fraction exceeds the capability of any existing combination of analytical techniques. However, adequate characterization is possible, even if it is limited to a description of the molecular weight distribution of the many overlapping homologous series (6,7).…”

Advances and Challenges in the Molecular Characterization of Petroporphyrins

“…Furthermore, the authors report that the composition of vanadyl porphyrins eluting in the most aggregated region spans the largest carbon number range, and as aggregation decreases, the carbon number range narrows and the average H/C ratio decreases to approximately 1.0, corresponding to porphyrin species with minimal alkyl chain pendant groups. 75 Additional studies have highlighted the effect of GPC on porphyrin characterization in heavy oil 69,[71][72][73][75][76][77][78][79][80] and applied GPC to understand hydrodemetallization and hydrodesulfurization processes. 81 High-performance thin-layer chromatography.…”

“…As aggregation decreases, the carbon number range narrows, and the average H/C ratio decreases to almost 1.0, corresponding to porphyrin species with minimal alkyl-chain pendant groups . Additional studies have highlighted the impact of GPC on porphyrin characterization in heavy oil ,− ,− and applied GPC to understand hydrodemetallization and hydrodesulfurization processes …”

Organic Compounds in Nature: Limits of Our Knowledge

“…Even with such partial analyses and with techniques that are inadequate for the complete resolution of complex mixtures into individual compounds, geochemists have made important contributions to pure and appliedje. g. exploration) At a higher degree of alkyl-substitution, many additional isomeric compounds become formally possible, and many of these may occur in fossil fuels [5] and in soils and recent sediments['. I together with chrysene and methylchrysenes.…”