Introduction of large volumes of methylene chloride in capillary GC with electron capture detection

J. Staniewski, J.G.M. Janssen, J.A. Rijks, C.A. Cramers

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Abstract

A system is presented that allows direct introduction of large vols. of CH2Cl2 in capillary gas chromatog. (GC) using the electron capture detector (ECD). The system is based on a 2-dimensional (1-oven) GC instrument equipped with a programmed temp. injector. During sample introduction, the solvent is eliminated via the split line. Residual traces of CH2Cl2 that enter the precolumn are eliminated via a column-switching device located between the precolumn and the anal. column. The system is used for the anal. for pesticides and polychlorinated biphenyls (PCBs) in CH2Cl2 at ultra low concns. The introduction of large sample vols. significantly improved the detection limits. Using the system described here, the solvent exchange step, normally necessary when the ECD is used to analyze samples contg. CH2Cl2 as the solvent, is no longer required
Original languageEnglish
Pages (from-to)429-432
JournalJournal of Microcolumn Separations
Volume5
Issue number5
DOIs
Publication statusPublished - 1993

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