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High temperature vaporizing chambers for large volume GC injections and on-line LC-GC

✍ Scribed by Boderius, Ulf ;Grob, Konrad ;Biedermann, Maurus

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
652 KB
Volume
18
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

The suitability of some chambers for sample evaporation at high input flow rates (>100 μl/min) was studied by visual experiments. The chambers were at temperatures far above the solvent boiling point in order to achieve the heat transfer required. Shooting liquid owing to violent evaporation, flooding of the chamber as a result of cooling, and excessively high vapor pressure causing backflow into the gas supply system were found to be the limiting factors. Fused silica capillaries into which a piece of wire or polyimide‐free fused silica capillary had been inserted were found to be suitable for the vaporization of “easy” solvents, such as alkanes (up to some 1.7 ml/min), but packed beds were required to achieve favorable evaporation of dichloromethane or methanol/water (up to some 800 and 300 μl/min, respectively).

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