Gas Chromatography/Fast-Atom Bombardment Mass Spectrometry of Carboxylic Acids

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Abstract
Combined gas chromatography/fast-atom bombardment mass spectrometry (GC/FABMS) method specific to the analysis of carboxylic acids is reported. The method is demonstrated in the analysis of organic acids in Freon extracts from oil well production water. The samples are run directly as the extracts. A direct measure of the isomer and molecular weight distribution of the acids is obtained using either FAB-positive or FAB-negative ion detection methods. The FAB-positive method detects the carboxylic acid-Catriethanolamine complexes that are formed on-line in the selvedge region of the FAB target, Ca-triethanolamine, matrix. The FAB-negative method detects the carboxylic acid anions that are formed in the selvedge region of a clean, stainless steel target plate. Both approaches are carboxylic acid-specific and require minimum preparation prior to analysis. Other components, such as hydrocarbons, also present in oil well water extracts are invisible to the method. This is the first report of the combination of GC and FABMS.

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