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China’s Gaosheng crude oil is characterized as being high in nickel and low in vana-dium.Nickel porphyrins were extracted with dimetrylformamide,concentrated by absorptionchromatography and demetallized with methylsulfonic acid.The concentrate of demetallizedporphyrins was then separated by centrifugal thin-layer chromatography,in which DPEP,ETIO,Di-DPEP,Rhdo-ETIO,Rhdo-DPEP and Rhodo-Di-DPEP types of porphyrin were iden-tiffed by mass spectrometry and UV-VIS spectroscopy.The possible geochemical pathwaysfrom DPEP to Di-DPEP and from Di-DPEP to Rhodo-DPEP series are discussed.
China’s Gaosheng crude oil is characterized as being high in nickel and low in vana-dium. Nickel porphyrins were extracted with dimetrylformamide, concentrated by absorption chromatography and demetallized with methylsulfonic acid. The concentrate of demetallized porphyrins was then separated by centrifugal thin-layer chromatography, in DPEP, ETIO, Di-DPEP, Rhdo-ETIO, Rhdo-DPEP and Rhodo-Di-DPEP types of porphyrin were iden-tiffed by mass spectrometry and UV-VIS spectroscopy. The possible geochemical pathways from DPEP to Di-DPEP and from Di- DPEP to Rhodo-DPEP series are discussed.