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Evaluation of frontal chromatograms.

U Wenzel1

  • 1Forschungszentrum Jülich GmbH, Institut für Sicherheitsforschung und Reaktortechnologie, Germany.

Journal of Chromatography. A
|October 9, 2001
PubMed
Summary

Deviations in frontal chromatography at low concentrations are explained by a prerun phenomenon. A new model accurately describes these frontal chromatograms, revealing an additional inflection point.

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Traditional chromatography theory assumes ideal conditions, but real-world applications often exhibit deviations.
  • Investigating these deviations is crucial for accurate quantitative analysis and method development.

Purpose of the Study:

  • To investigate deviations from standard chromatographic theory in frontal chromatograms at low effluent concentrations.
  • To develop a mathematical model explaining these deviations and their dependence on column and particle geometry.

Main Methods:

  • Analysis of frontal chromatograms at low effluent concentrations.
  • Development of a mathematical model incorporating a 'prerun' phenomenon between column walls and particles.
  • Experimental verification of the model's predictions.

Main Results:

  • Observed deviations from theory in frontal chromatograms at low concentrations.
  • A novel model predicts an additional inflection point in frontal chromatograms.
  • Model coordinates are dependent on column/particle geometry and packing density, not kinetics or surface deterioration.

Conclusions:

  • The developed model successfully describes frontal chromatograms up to the second inflection point.
  • The 'prerun' phenomenon is a key factor influencing low-concentration frontal chromatogram behavior.
  • The findings have potential technical applications in chromatographic analysis.

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