Summary
A model is proposed that avoids the need for the controversial labyrinth (or multipath) term γ when dealing with packed columns. In accordance with early assumptions of Purnell [3] it is shown that molecules in the mobile phase diffuse longitudinally for only part of their residence time in the column. The fraction of residence time is a simple function of the specific pore volume of the support and the interparticle volume. From this function it can be concluded that the magnitude of γ must be in the range 0.4<γ≤1. No experimental proof of that model is given.
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References
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Deininger, G. The nature of the B-term in the van Deemter equation. Chromatographia 9, 251–254 (1976). https://doi.org/10.1007/BF02276295
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DOI: https://doi.org/10.1007/BF02276295