The effects of molecular collisions between the mobile phase and the solute in gas-solid chromatography

In chromatographic processes, molecular collisions between the mobile phase and the solute result in the transfer of kinetic energy. Based on these interactions, the relationship between the gauge pressure of the carrier gas at the column inlet and the partition frequency of the solute is derived; c...

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Bibliographic Details
Published in:Journal of separation science 2015-10, Vol.38 (19), p.3390-3396
Main Authors: Zhang, Dali, Ke, Jiajun, Lu, Lizhu
Format: Article
Language:English
Subjects:
Chromatography
Chromatography, Gas - methods
Energy Transfer
Flow velocity effect
Hydrocarbons - chemistry
Inlets
Kinetic energy
Kinetics
Mathematical analysis
Molecular chemistry
Molecular collisions
Normal Distribution
Partitions
Peak tailing
Plate theory
Solutions - chemistry
Tailings
Temperature
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Summary:In chromatographic processes, molecular collisions between the mobile phase and the solute result in the transfer of kinetic energy. Based on these interactions, the relationship between the gauge pressure of the carrier gas at the column inlet and the partition frequency of the solute is derived; consequently, the relationship between the column temperature and partition frequency can be obtained. These relationships have been experimentally validated. The change in the peak shape described herein has been successfully explained using this relationship: the partition frequency was calculated from the theoretical plate number of a tailing peak. We propose a new mechanism for peak tailing using plate theory, which states that as the number of plates increases, the symmetry of the peak increases.
ISSN:1615-9306
1615-9314
DOI:10.1002/jssc.201500196