| 4 | Composition of substituents on pyrrole ring of high-carbon-number geoporphyrins and its dealkylation显示文摘Geoporphyrins, isolated from source rock, were analyzed on electron ionization mass spectrometry (EIMS) and Tandem mass spectrometry (MS/MS). The spectrum of ElMS shows that the geoporphyrins are mainly composed of two types: DPEP and eito. Most of the porphyrin carbon numbers are greater than C32. The daughter spectra of the molecular ions (C34-36DPEPs) display the loss of methyl and ethyl groups, which indicate there are ethyl and propyl groups in the mother ions. The average condensed structural formulae, derived from the data of the spectra on MS/MS, have clearly shown the composition of the substituents on the porphyrin pyrrole ring, and the regular changes of the substituents reveal the characteristics of the dealkylation of the porphyrins in the geosphere. | ZHANG Chunming and LIN Renzi Geochemistry Research Center, Jianghan Petroleum Institute, Jingzhou 434102, China Department of Geoscience, University of Petroleum , Beijing 100083, China | 1999 | Chinese Science Bulletin1999，44，3： | 0 |
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