Overtake phenomena in the movement process of components under temperature programming gas chromatography

Lin, Bingcheng; Bing-chang, Lin; Koppenhoefer, Bernhard

doi:10.1021/ac00170a030

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Cited by 10 publications

References 21 publications

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Gas Chromatography

2009

Chromatography

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Gas Chromatography

2009

Chromatography

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Formation of Peak Spacing

Blumberg¹

2010

Temperature‐Programmed Gas Chromatography

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When two solutes, say 1 and 2, simultaneously injected in a column migrate along the column with different velocities, v 1 and v 2 , their longitudinal distance,from each other, and temporal distancethe difference,is thermal spacing of the peaks. Generally, a closed form solution for Dt R cannot be obtained. A numerical solution can be found from subtraction of numerical solutions of Eqs. (8.27) and (8.28) for t R1 and t R2 . In several practically important special cases, substantial simplifications in evaluations of Dt R or DT R can be made.where v oR is the outlet velocity of the t R -solute at the time t R of its elution. The last formula is based on two assumptions. First, the change in Dz R during the time interval Dt R is negligible compared to Dz R , and, second, the difference between v oR and the outlet velocity, v oR,1 , of the neighboring solute is negligible compared to v oR . Both the assumptions are direct consequence of the properties of the solutes that make them to migrate close to each other. The negative sign in the formula reflects the fact that t R,1 > t R when the t R -solute arrives to the column outlet before its neighbor, and therefore, Dz R ¼ z 1,R À L < 0.An infinitesimally small change, d(Dz), in Dz that takes place during infinitesimally small time interval, dt, when the t R -solute and its neighbor advance from arbitrary locations, z and z 1 to locations z þ dz and z 1 þ dz 1 , respectively, can be 194j 9 Formation of Peak Spacing 9.2 Closely Migrating Solutes in Dynamic Analysis j195

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Effect of high temperature in determination of the mathematical dead time and the constants of the n‐alkane retention time curve in gas chromatography

Didaoui

Touabet

Meklati

1996

J. High Resol. Chromatogr.

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SummaryIn gas liquid chromatography, the column dead time and the constants of the n-alkane retention time curve are calculated by the multiparametric least-squares regression iterative method at high temperature between 180 and 270 "C. The method was applied to two types of columns. The first group includes eight packed columns (seven OV polymethylphenylsiloxane and Apolane-87), while the second includes five glass capillary columns (four methylsilicone with different film thicknesses and Apolane-87). The calculated t~ and b values were compared with those obtained by Guardino's, Grobler's, and Kaiser's methods. The influences of coating thickness and temperature thereon were investigated.

show abstract

Overtake phenomena in the movement process of components under temperature programming gas chromatography

Cited by 10 publications

References 21 publications

Gas Chromatography

Gas Chromatography

Formation of Peak Spacing

Effect of high temperature in determination of the mathematical dead time and the constants of the n‐alkane retention time curve in gas chromatography

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