Determination of solvent recondensation or evaporation in the GC-precolumn by measurement of temperature changes on the column wall
✍ Scribed by Hyötyläuinen, Tuulia ;Grob, Konrad ;Riekkola, Marja-Liisa
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 839 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0935-6304
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✦ Synopsis
Abstract
Temperature measurements on the column outer well were used for detecting recondensation or evaporation of solvent inside the precolumn during injection or on‐line transfer of large solvent volumes. This facilitates the choice of the most critical parameter of these techniques, i.e. oven temperature. When using the vaporizer/precolumn solvent split/gas discharge system, the dew point of the solvent is determined, either to just prevent solvent recondensation or to limit it to the capacity of the precolumn to retain liquid. In concurrent eluent evaporation through the loop type LC‐GC interface, temperature measurement enables the determination of whether or not the flooded zone exceeds a given limit. Fanally, when solvent trapping is used (on‐column injector/partially concurrent solvent evaporation evaporation or vaporizer/partial recondensation), temperature measurement near the front end of the flooded zone is used as a signal for accurate closure of the vapor exit shortly before the end of solvent evaporation.