Organometallic geochemistry. 2. The molecular characterization of trace organometallic and inorganic compounds of arsenic found in Green River Formation oil shale and its pyrolysis product
The isolation and molecular characterization of naturally occurring methyl- and phenylarsonic acids, 1 and 2, and the inorganic arsenic anion, arsenate, 3, from a Green River Formation oil shale sample were accomplished by separation on a high-performance liquid chromatograph (HPLC) coupled to a graphite-furnace atomic absorption spectrometer (GFAA) for arsenic detection. This was followed by a derivatization technique and analysis by capillary-column gas chromatography-mass spectrometry (GC-MS). The arsenate, 3, was also isolated via HPLC-GFAA analysis and derivatized to provide tris(trimethylsilyl) arsenate, which was also verified by GC-MS analysis. The pyrolysis of Green River Formation oil shale gives the corresponding shale oil. In addition, a neutral organoarsenic compound(s) was isolated from the oil shale sample by preparative HPLC; however, all attempts to verify its molecular-structure by GC-MS analysis as either trimethylarsine oxide or the corresponding phenyl derivative were unsuccessful. Extraction of a shale oil derived from the Paraho surface retort, with ammonium bicarbonate, gave indications of 1 and 3 and possible traces of 2 by HPLC-GFAA analysis. Derivatization of these extracts provided the identification of 1, but not 2, while 3 was verified by its tris (trimethylsilyl) derivative. The same compounds 1 and 3 were also isolated from the shale oil directly, by size-exclusion chromatography (SEC-HPLC), and identified via derivatization and GC-MS analysis. 25 refs., 7 figs.
- Research Organization:
- Univ. of California, Berkeley
- OSTI ID:
- 6440831
- Journal Information:
- Energy Fuel; (United States), Journal Name: Energy Fuel; (United States) Vol. 1:3; ISSN ENFUE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
040500* -- Oil Shales & Tar Sands-- Properties & Composition
ABSORPTION SPECTROSCOPY
ARSENATES
ARSENIC COMPOUNDS
ARSONIC ACIDS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMATOGRAPHY
DERIVATIZATION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
GEL PERMEATION CHROMATOGRAPHY
GEOLOGIC FORMATIONS
GREEN RIVER FORMATION
LIQUID COLUMN CHROMATOGRAPHY
MASS SPECTRA
MATERIALS
MINERAL OILS
OIL SHALES
OILS
ORGANIC ACIDS
ORGANIC ARSENIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
QUALITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SHALE OIL
SPECTRA
SPECTROSCOPY