Identifying alkylbenzene isomers with chemical ionization-proton exchange mass spectrometry
Chemical ionization-proton exchange mass spectrometry (CIPE) allows the number of unsubstituted aromatic carbons in alkylbenzene isomers to be determined. Only the aromatic hydrogens undergo exchange with deuterium when deuterated water, methanol, or ethanol is used as the reagent gas. Chemical ionization with deuterated methanol gives an acceptable mass spectral background and allows the determination of the number of unsubstituted positions on the benzene ring yielding structural information often unavailable from conventional electron impact spectra. Structural isomers such as propyl-, methylethyl-, and trimethylbenzene can easily be identified. The comparison of CIPE spectra from standard compounds, which are often unavailable, is not required to determine the number of unsubstituted aromatic carbons in alkylbenzene isomers. The method also allows ortho and para to be distinguished from meta disubstituted alkylbenzenes. Deuteriomethanol chemical ionization is used to characterize alkylbenzenes in a complex and relatively well studied sample, diesel exhaust. 14 references, 3 figures, 3 tables.
- Research Organization:
- Univ. of North Dakota Energy Research Center, Grand Forks
- DOE Contract Number:
- FC21-83FE60181
- OSTI ID:
- 6036406
- Journal Information:
- Anal. Chem.; (United States), Vol. 57:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AROMATICS
STRUCTURAL CHEMICAL ANALYSIS
DEUTERIUM
ISOTOPE EFFECTS
ISOMERS
EXPERIMENTAL DATA
IONIZATION
MASS SPECTROSCOPY
TRACER TECHNIQUES
DATA
HYDROGEN ISOTOPES
INFORMATION
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
SPECTROSCOPY
STABLE ISOTOPES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400302 - Organic Chemistry- Isotope Effects- (-1987)