Principles of High-Speed Gas Chromatography with Packed Columns

Ayers, B. O.; Loyd, R. J.; DeFord, D. D.

doi:10.1021/ac60176a036

Cited by 34 publications

(32 citation statements)

References 5 publications

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“…In the derivation of the van Deemter equation, finite rate of mass transfer in the gas phase was omitted because estimates indicated that its contribution would be negligible compared to that of the liquid phase. or less than dp have been found by many workers (1,7,8,15,32,33,45,56) while others have apparently found negative A values (7,33,52,60). Some evidence has been presented that indicates that A is velocity dependent (7,35,60).…”

Section: Literature Review Historical Developmentmentioning

confidence: 87%

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Solid Support Characteristics and Plate Height in Gas Chromatography.

Harper¹,

Hammond²

1965

Anal. Chem.

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Constants for a plate heightvelocity equation were determined for stationary phase supports, made by lyophilizing a mixture of inorganic salts, and Chromosorb P. This allowed a study of the effect of porosity and pore size distribution on the equation constants. The value of the obstructive factor, , in the longitudinal diffusion coefficient, B/, increased with increases in intraparticle void. This suggests that 7 is the sum of intraand interparticle contributions. The values of C/ decreased as the intraparticle void increased. This term should be a measure of resistance to mass transfer in the stagnant gas inside the particles, but it may also contain a contribution from the coupled eddy diffusion term. The values of C/, the

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Section: Literature Review Historical Developmentmentioning

confidence: 87%

“…The value of A has been found by some researchers (5,14,16,49,61) to increase as dp decreases while others (1,6) have found it independent of dp. The usual graphical and numerical curve fitting techniques have been unable to resolve this question.…”

Section: Literature Review Historical Developmentmentioning

confidence: 93%

Solid Support Characteristics and Plate Height in Gas Chromatography.

Harper¹,

Hammond²

1965

Anal. Chem.

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“…Almost simultaneously with Desty and Goldup retraction, stronger and more specific objections were published by Ayers et al [216] in July 1961. u 2 , where u is the average gas velocity, to represent the relationship of plate height to carrier gas velocity. While plots of this type are satisfactory for short columns having low pressure drops ( u % u o ), marked deviations from linearity occur if the column pressure drop is high.…”

Section: Immediate Objections and Retractionsmentioning

confidence: 94%

Formation of Peak Widths

Blumberg¹

2010

Temperature‐Programmed Gas Chromatography

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“…These drawbacks of Purnell's model were corrected by Ayuers et al. . They have combined van Deemter equation (used in the form Hu o = B + Cu o 2 ) and an equation for the retention time of a solute t R :

t_{normalR} = (k_{normalR} + 1) \frac{2 L (P^{3} - 1)}{3 u_{o} (P^{2} - 1)}

and derived the following relationship:

t_{normalR} = [\frac{{(q + Z)}^{\frac{3}{2}} - 1}{Z}] \frac{2 (k_{normalR} + 1) C N}{3}

with

q = 1 + \frac{φ B N}{p_{o}} and Z = \frac{φ C N}{p_{o}} u_{o}^{2}

…”

Section: Gcmentioning

confidence: 99%

“…According to Ayuers et al. it can be shown that for known q the separation can be achieved in a minimum time if the outlet velocity u o is adjusted so that the value of Z is given by:

Z_{opt} = q [1 - 2 \cos (\frac{ψ}{3} + 240^{normalo})]

where ψ can be found from the following equation:

\cos ψ = \frac{q^{3} - 2}{q^{3}}

…”

Section: Gcmentioning

confidence: 99%

Application of kinetic plots in gas and liquid chromatography for the optimization of separation conditions

Kurganov

Kanat’eva

Yakubenko

2015

J of Separation Science

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This review describes the recent achievements and historical background of investigations in optimization procedures in gas and liquid chromatographic techniques. The optimization parameters are varied depending on researcher interests and may include separation efficiency, analysis time, column operation pressure, packing characteristics, etc. As it is shown the kinetic performance limit is one of the most used and vital concepts for gas and liquid chromatography. Application of the concept sometimes requires additional cumbersome calculations but nevertheless it provides the most grounded comparison of different packings, columns, and techniques.

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Principles of High-Speed Gas Chromatography with Packed Columns

Cited by 34 publications

References 5 publications

Solid Support Characteristics and Plate Height in Gas Chromatography.

Solid Support Characteristics and Plate Height in Gas Chromatography.

Formation of Peak Widths

Application of kinetic plots in gas and liquid chromatography for the optimization of separation conditions

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