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

✍ Scribed by Jacek Staniewski; Hans-Gerd Janssen; Jacques A. Rijks; Carel A. Cramers

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 347 KB
• Volume: 5
• Category: Article
• ISSN: 1040-7685
• DOI: 10.1002/mcs.1220050506

✦ Synopsis

Abstract

In this paper, a system is presented that allows direct introduction of large volumes of methylene chloride in capillary gas chromatography (GC) using the electron capture detector (ECD). The system is based on a two‐dimensional (one‐oven) GC instrument equipped with a programmed temperature injector. During sample introduction, the solvent is eliminated via the split line. Residual traces of methylene chloride that enter the precolumn are eliminated via a column‐switching device located between the precolumn and the analytical column. The system is used for the analysis of pesticides and polychlorinated biphenyls (PCBs) in methylene chloride at ultra low concentrations. The introduction of large sample volumes significantly improved the detection limits. Using the system described here, the solvent exchange step, normally necessary when the ECD is used to analyze samples containing methylene chloride as the solvent, is no longer required.