Measurement and prediction of dead times and column diameter in capillary gas chromatography by using air, methane and some solvents

Rapid Temperature-Programmed Separation and Retention Prediction on a Novel Packed-Capillary Column in Gas Chromatography

“…[13][14][15][16][17][18][19][20][21] In contrast to a number of papers for a theoretical prediction of the retention in GC, a comprehensive comparison of the compatibility of packed columns having different internal diameters to a rapid temperature program in a modern GC system had been quite limited. [21][22][23] In this work, novel packed-capillary columns were developed with a thin-wall capillary of stainless-steel, and the compatibility to a fast temperature-programmed separation was studied on the basis of a theoretical prediction of the retention by a numerical-integration method. To confirm the compatibility of the developed packed-capillary columns to the temperature program, the observed retention data of a standard sample at different temperature-programming ramps were compared with the corresponding theoretical value predicted by a set of retention data at each column temperature.…”

Determination and evaluation of gas holdup time with the quadratic equation model and comparison with nonlinear models for isothermal gas chromatography

“…The t M values increase with T c due to the increased dynamic viscosity of the carrier gas [9,39,40]. Fig.…”

“…Methane [6] and the front of solvent peak at a high column temperature have been used as a marker of an unretained solute, because the flame ionization detector (FID) does not respond to air and inert gas. However, further studies have shown that air, inert gases, methane and solvents (as the front of solvent peak) are clearly retained [7,8,9]. Neon is not always the least retained gas [10].…”

“…An unretained substance does not exist in GC [10,13]. Calculation methods were considered a good alternative approach [9,10,13–15]. …”

Evaluating the Holdup Time of Gas-Chromatographic Systems in Various Temperature Regimes by Using Recurrent Relations

“…Fairly often they can be equalled to retention times of low boiling organic solvents [6,7]. In the use of such solvents, it seems more correct to measure retention parameters not in the maxima of chromatographic peaks, but in their initial part (in any point on their front edges), as it was recommended in [8].…”