Nonlinearity, correlation chromatography

Efficiency, N The column efficiency characterizes the combined effects of the sources of band broadening due to axial dispersion and mass transfer resistance. It is derived from the width of the elution peak observed as the response to the injection of a small, narrow pulse of a dilute solution of a compoimd. It is difficult to correct for the contribution of the extracolumn sources of band broadening which have to be kept small. In preparative and nonlinear chromatography, there is a correlation between the colmnn efficiency and both the steepness of the shock layer and the duration of the band beyond the retention time However, the column efficiency is essentially a concept of linear chromatography, and it is difficult to extend to and use in nonlinear chromatography, except through the shock layer thickness concept. 

Correlation of the parameters of heterogeneous surface active sites or its distribution functions on these parameters with activation parameters of organic compound chemisorption on the oxides surface is required for establishment of the reaction mechanism (for example, SeI or SnI)- An approach for calculation of distribution functions of heterogeneous surface active sites on the donor, acceptor and polarization components of organic compounds adsorption energy using the nonlinear inverse gas chromatography... 

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