Characterization and comparison of vanadyl and nickel compounds in heavy crude petroleums and asphaltenes by reverse-phase and size-exclusion liquid chromatography/graphite furnace atomic absorption spectrometry
Vanadyl and nickel non-porphyrin rich fractions have been characterized in pyridine/water extracts of four heavy crude petroleums using reverse-phase high-performance liquid chromatography in combination with element-selective graphite furnace atomic absorption detection (RP-HPLC/GFAA). On the basis of rapid-scan UV-vis data indicating a lack of Soret absorbance associated with separated vanadyl and nickel containing fractions, we have categorized highly polar nickel compounds as non-porphyrin in Boscan, Cerro Negro, Wilmington, and Prudhoe Bay heavy crude petroleums. The presence of lower polarity vanadyl non-porphyrin compounds, occurring primarily in Wilmington and Prudhoe Bay petroleum, has also been confirmed. The vanadium histogrammic profiles, obtained using reverse-phase and size-exclusion HPLC/GFAA analysis for compounds extracted from the n-pentane (40:1) precipitated asphaltenes, were similar when compared to the pyridine/water extracts from the heavy crude petroleums.
- Research Organization:
- Univ. of California, Berkeley
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5671585
- Journal Information:
- Anal. Chem.; (United States), Vol. 56:13
- Country of Publication:
- United States
- Language:
- English
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Molecular characterization and fingerprinting of vanadyl porphyrin and non-porphyrin compounds in the asphaltenes of heavy crude petroleums using HPLC-GFAA analysis
Molecular characterization and profile identifications of vanadyl compounds in heavy crude petroleums by liquid chromatography/graphite furnace atomic absorption spectrometry
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
ASPHALTENES
QUANTITATIVE CHEMICAL ANALYSIS
NICKEL
ABSORPTION SPECTROSCOPY
LIQUID COLUMN CHROMATOGRAPHY
PETROLEUM
VANADIUM
EXPERIMENTAL DATA
PENTANE
PYRIDINE
SOLVENT EXTRACTION
WATER
ALKANES
ASPHALTS
AZINES
BITUMENS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
ELEMENTS
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PYRIDINES
SEPARATION PROCESSES
SPECTROSCOPY
TAR
TRANSITION ELEMENTS
400102* - Chemical & Spectral Procedures
400104 - Spectral Procedures- (-1987)
023000 - Petroleum- Properties & Composition