This paper presents the development of chromatography, two mathematical methods for describing chromatographic phenomena, band broadening processes as well as the procedure for retention volume measurement and calculation. The plate and the rate theories for gas chromatographic phenomena are comprehensively discussed. The reduction of infinite dilution activity coefficients from retention data is explained. While the rate theory can predict the influence of various factors on column performance, the plate theory is more useful in the calculation of thermodynamic properties such as infinite dilution activity coefficients, enthalpy and entropy of mixtures
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