Determination of C1−C4 fatty acids as p-bromophenacyl esters using glass-capillary gas chromatography and electron-capture detection |
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Authors: | M. Larsson C. Roos |
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Affiliation: | (1) Department of Analytical and Marine Chemistry, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden;(2) National Laboratory of Forensic Chemistry, Department of Toxicology, S-581 85 Linköping, Sweden |
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Abstract: | Summary A method for the determination of low relative molecular mass carboxylic acids (C1–C4) in water is reported. The acids are converted to p-bromophenacyl esters prior to a glass-capillary gas chromatographic separation. By utilizing electron-caputre detection the detectability is substantially improved compared to flame-ionization detection. A comparison of three different ways to treat the water samples and to produce the derivatives is made. It is shown that the , p-dibromoacetophenone reagent decomposes to a small extent which limits the utility of the reagent. Nevertheless a detection limit for formic acid of approximately 2.5 mgl–1 is obtained. The method is applied to the determination of formic and acetic acids in a paper kraft water sample. |
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Keywords: | Glass-capillary GC Electron-capture detection C1– C4 carboxylic acids p-Bromophenacyl esters Reagent degradation products |
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