Estimation of vanadyl porphyrin concentration in sedimentary kerogens and asphaltenes
| Autor: | M. S. Pavlovic, I. R. Tonsa, Pavle I. Premović, Nikola D. Nikolić, T. Allard |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
concentration
General Chemical Engineering Analytical chemistry Energy Engineering and Power Technology 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences law.invention kerogen chemistry.chemical_compound 020401 chemical engineering law Kerogen Organic chemistry vanadyl porphyrins 0204 chemical engineering Electron paramagnetic resonance 0105 earth and related environmental sciences Asphaltene chemistry.chemical_classification estimation musculoskeletal neural and ocular physiology Organic Chemistry Method of analysis Porphyrin Quantitative determination Fuel Technology Hydrocarbon chemistry Sedimentary rock human activities circulatory and respiratory physiology |
| Zdroj: | Fuel |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/s0016-2361(99)00205-7 |
| Popis: | We describe a new, rapid method for determining the concentration of vanadyl porphyrins (VO2+-P) associated with the kerogen of bituminous sedimentary rocks using electron spin resonance (ESR). The method is simple, straightforward and inexpensive. Several concentrations of a vanadyl (VO2+) standard dissolved in glycerol-lignite mixture were prepared. The VO2+ concentrations ranged from 100 to 1000 ppm. The anisotropic ESR spectra of both the standards and kerogen samples were recorded at room temperature and the integrated areas of the pre-selected ESR line (attributed to nuclear spin m(t) = -5/2) were computed. The concentrations of VO2+ found in the kerogen samples were calculated using the relative ratio of the integrated areas for the standards and the kerogen samples. The VO2+-P concentrations of the kerogen materials were then calculated using 350 as the mean molecular weight of these species. Quantitative determination of VO2+-P in the kerogen fractions in the range of 800-8000 ppm and higher is feasible by the method reported. The method of analysis was also extended to the asphaltene samples (enriched with VO2+-P) and a coal sample containing non-porphyrin VO2+ associated with its organic fraction. (C) 2000 Elsevier Science Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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