Estimation of vanadyl porphyrin concentration in sedimentary kerogens and asphaltenes
Abstract
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.
Keywords:
vanadyl porphyrins / kerogen / estimation / concentrationSource:
Fuel, 2000, 79, 7, 813-819
DOI: 10.1016/S0016-2361(99)00205-7
ISSN: 0016-2361
WoS: 000086311100011
Scopus: 2-s2.0-0342758526
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Institution/Community
VinčaTY - JOUR AU - Premović, Pavle I. AU - Allard, T AU - Nikolic, ND AU - Tonsa, Ivana R. AU - Pavlović, Mirjana S. PY - 2000 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2338 AB - 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. T2 - Fuel T1 - Estimation of vanadyl porphyrin concentration in sedimentary kerogens and asphaltenes VL - 79 IS - 7 SP - 813 EP - 819 DO - 10.1016/S0016-2361(99)00205-7 ER -
@article{ author = "Premović, Pavle I. and Allard, T and Nikolic, ND and Tonsa, Ivana R. and Pavlović, Mirjana S.", year = "2000", abstract = "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.", journal = "Fuel", title = "Estimation of vanadyl porphyrin concentration in sedimentary kerogens and asphaltenes", volume = "79", number = "7", pages = "813-819", doi = "10.1016/S0016-2361(99)00205-7" }
Premović, P. I., Allard, T., Nikolic, N., Tonsa, I. R.,& Pavlović, M. S.. (2000). Estimation of vanadyl porphyrin concentration in sedimentary kerogens and asphaltenes. in Fuel, 79(7), 813-819. https://doi.org/10.1016/S0016-2361(99)00205-7
Premović PI, Allard T, Nikolic N, Tonsa IR, Pavlović MS. Estimation of vanadyl porphyrin concentration in sedimentary kerogens and asphaltenes. in Fuel. 2000;79(7):813-819. doi:10.1016/S0016-2361(99)00205-7 .
Premović, Pavle I., Allard, T, Nikolic, ND, Tonsa, Ivana R., Pavlović, Mirjana S., "Estimation of vanadyl porphyrin concentration in sedimentary kerogens and asphaltenes" in Fuel, 79, no. 7 (2000):813-819, https://doi.org/10.1016/S0016-2361(99)00205-7 . .