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Independently temperature programmed uncoated precolumn: A concept for improved sample introduction in capillary GC

✍ Scribed by Gunnar Hagman; Johan Roeraade

Book ID
102503477
Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
430 KB
Volume
5
Category
Article
ISSN
1040-7685

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✦ Synopsis

Abstract

In this paper, a GC sample introduction technique is described in which an uncoated precolumn and the analytical capillary column are individually temperature programmed. The influence of different rates of temperature programming of the retention gap on band broadening of a series of n‐alkanes has been investigated for different lengths of the precolumn. It is shown that extra column band broadening of high boiling solutes is reduced when the temperature of the precolumn is ramped at a faster rate than the analytical column. This benefit is particularly pronounced when long retention gaps are employed.

The technique extends the useful lifetime of the analytical column when complex real‐world samples with a wide volatility range are analyzed. This is due to the fact that the final temperature of the precolumn can be kept below the final temperature of the analytical column. Thus, the column is not contaminated with high boiling non‐elutable solutes.

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