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Computer-controlled vacuum backflush for capillary GC

✍ Scribed by Rankin, Christine ;Sacks, Richard

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
466 KB
Volume
13
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

A vacuum‐pump‐operated backflush system has been developed for applications involving high‐speed, repetitive GC analysis of gas streams containing ppm and ppb levels of organic vapor. The system uses an injector capable of cryofocusing and a relatively short length of 0.25‐mm i.d. fused silica column for the separation of relatively simple mixtures of volatile compounds. Analysis times typically are in the 5–10 s range, and backflush times are in the 2–5 s range. Gases from the flame ionization detector are used as the backflush carrier gas, and no modification of the detector is necessary. A procedure is described which allows the average gas velocity to be measured during backflush operation. The minimum backflush time is directly proportional to the analysis time and to the square of the column length, making this system most useful with short columns and short analysis times.

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