Active Control of Selectivity in Organic Acid Analysis by Gas Chromatography

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dc.contributor.authorDarko, Ernest
dc.contributor.authorThurbide, Kevin B.
dc.date.accessioned2020-03-05T17:05:24Z
dc.date.available2020-03-05T17:05:24Z
dc.date.issued2020-03-04
dc.description.abstractA new method that allows organic acid selectivity to be dynamically controlled during gas chromatography (GC) is presented. It employs dual in-series stainless steel columns, each coated with a pH-adjusted water stationary phase. The first is a 2 m column coated with a pH 11.4 phase that is connected to a second 11 m column coated with a pH 2.2 phase. In this arrangement, organic acids within sample mixtures are trapped on the first column, while the remaining non-ionizable components continue to separate and elute in the system. Later, by injecting a volatile formic acid solution, the trapped acids are released in-situ to the second column for separation and analysis as desired. The method provides good reproducibility with analyte retention times in consecutive trials yielding an average RSD of 1.9 %. Further, depending on column temperature, analytes can be readily retained for periods investigated up to about 30 minutes without significant deterioration in peak shape. This feature provides considerable control over analyte selectivity and resolution compared to conventional separations. Further, by adding a third conventional GC column in-series, both typical hydrocarbon and enhanced organic acid separations are made possible. The method is applied to the analysis of complex mixtures and matrix interference is found to be significantly minimized. Results indicate that this approach offers beneficial advantages for the selective GC analysis of such acidic analytes.en_US
dc.description.grantingagencyNatural Sciences and Engineering Research Council (NSERC)en_US
dc.identifier.citationDarko, E., & Thurbide, K. B. (2020). Active Control of Selectivity in Organic Acid Analysis by Gas Chromatography. "Analytica Chimica Acta". doi.org/10.1016/j.aca.2020.01.059en_US
dc.identifier.doihttps://doi.org/10.1016/j.aca.2020.01.059en_US
dc.identifier.urihttp://hdl.handle.net/1880/111716
dc.identifier.urihttps://doi.org/10.11575/PRISM/46054
dc.language.isoengen_US
dc.publisher.departmentChemistryen_US
dc.publisher.facultyScienceen_US
dc.publisher.hasversionacceptedVersionen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.rightsUnless otherwise indicated, this material is protected by copyright and has been made available with authorization from the copyright owner. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.titleActive Control of Selectivity in Organic Acid Analysis by Gas Chromatographyen_US
dc.typejournal articleen_US
ucalgary.item.requestcopytrueen_US
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