Determination of organic acids in air by capillary electrophoresis and ion-exclusion chromatography |
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Authors: | A Levart M Gu?ek B Pihlar M Veber |
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Institution: | (1) Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, 1000 Ljubljana, Slovenia |
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Abstract: | Summary A capillary electrophoretic (CE) method for the determination of organic acids in the low ppm range is described. The buffer
consisted of 5 mM 2,6-pyridinedicarboxylic acid and 0.5 mM cetyltrimethylammonium bromide, pH 5.6. The former served as background
electrolyte for indirect UV detection at 200 nm, whereas the latter was used to reverse electroosmotic flow. In <5 min 8 low
molecular mass organic acids (oxalic, formic, malonic, glutaric, glycolic, acetic, lactic and propanoic) and two inorganic
acids (hydrochloric and sulphuric) were separated. Detection limits for anions tested were 0.04 mg L−1 (lactic acid) to 0.6 mg L−1 (malonic acid).
The method was applied to the determination of organic acids in air samples. The CE results when compared with ion-exclusion
chromatography (IEC) agreed well. The use of electrokinetic injection in CE proved beneficial for preconcentration of organic
acids in real samples. Using electrokinetic injection, preconcentration factors ranging from 14 (hydrochloric acid) to 3 (propanoic
acid) were obtained.
Presented at Balaton Symposium on High-Performance Separation Methods, Siófok, Hungary, September 1–3, 1999 |
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Keywords: | Capillary electrophoresis Ion-exclusion chromatography Organic acids in air Electrokinetic injection |
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