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Flow of the carrier gas in open-tubular capillary columns in temperature-programmed gas chromatography

✍ Scribed by Hevesi, Tibor ;Krupcík, Ján

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
445 KB
Volume
20
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

A second‐order non‐linear partial different equation was derived to describe the dependence of carrier gas pressure in the column on the column distance and the time under temperature programmed conditions. This equation was solved numerically by the modified finite difference method for various column parameters. Constant inlet and outlet pressures were used as boundary conditions. The retention times calculated on assumption of a constant pressure profile along the column. Significant differences between retention times of corresponding solutes calculated by the two methods were found, especially when relatively long columns(L>50m) with small internal diameter(d<0.3mm)and high temperature program rates (r>5°/min)are used.

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