Abstract
AbstractA novel sampling system for isothermal capillary gas chromatography of medium‐ or low‐volatility mixtures is described and test results are reported using flame ionization detection. The system features a loading and positioning chamber for glass vials which can carry a dilute sample in up to 0.2 ml of a volatile solvent. The output from the glass vaporization chamber is trapped onto a packed precolumn operated in the backflush mode. The analytes are further transferred over a wall‐coated capillary trap prior to isothermal capillary GLC. Repeat‐cycle operation of the sampling system requires 10 channels of a processor for time control over 5 solenoid valves and 3 static heaters. Preliminary results with long‐chain n‐alkanes in the submicrogram range showed no unwanted effects. The principal claim of the system is an improved rejection of non‐volatiles.
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