Multi-dimensional chromatography using on-line coupled microcolumn liquid chromatography—capillary gas chromatography for quantitative pesticide residue analysis |
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Authors: | Hernan J Cortes Edward L Olberding James H Wetters |
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Institution: | The Dow Chemical Company, Analytical Sciences, 1897 Building, Midland, MI 48667 U.S.A;The Dow Chemical Company, North American Agricultural Products Department, 9001 Building, Midland, MI 48641 U.S.A |
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Abstract: | Highly selective separations can be achieved by utilizing different separation modes in a multi-dimensional (on-line coupled) chromatographic system. The application of such a system utilizing microcolumn liquid chromatography coupled on-line to capillary gas chromatography for the determination of 2-(1,1-dimethylethyl)-5-pyrimidinol, a pesticide metabolite, in various corn matrices at the ng g?1 level is described. A comparative quantitative study with conventional manual sample pretreatments followed by capillary gas chromatography-mass spectrometry indicated equivalence between the two techniques. The system offers the advantages of reduced sample handling steps and analysis time, high potential for automation and adequate sensitivity. |
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Keywords: | Pesticides Pyrimidinol Corn |
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