Determination of carboxylic acids in oil samples by capillary gas chromatography/mass spectrometry
A combined gas chromatography/mass spectrometric (GC/MS) method for measuring carboxylic acids in oil samples without first going through solvent extraction and group separation is reported. The carboxylic acids in oils are directly derivatized to their corresponding methyl esters via anion formation in tetramethylammonium hydroxide/methanol/methyl iodide/n-butyl acetate solutions prior to GC/MS analysis using a glass wall coated capillary column. The reaction is mild, selective, and rapid. It can usually be carried out at room temperature and completed in 10 to 15 min. Multiple ion detection techniques (MID) can be readily used to further resolve methyl esters from other compounds if necessary.
- Research Organization:
- Standard Oil Co., Cleveland, OH
- OSTI ID:
- 6543336
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 53:3; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
023000 -- Petroleum-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
CARBOXYLIC ACID ESTERS
CARBOXYLIC ACIDS
CHROMATOGRAPHY
DATA
ESTERS
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
INFORMATION
MASS SPECTROMETERS
MEASURING INSTRUMENTS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
SEPARATION PROCESSES
SPECTROMETERS