Comparison of mathemical methods for the calculation of retention indices at high temperature in gas chromatography

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Abstract
The retention indices of three homologous series (2‐alkanones, 1‐alkanols, cycloalksanones) have been determined at high temperature by the application of two new adaptation methods: A multiparametric least‐squares regressions iterative method based on the dertermination of the adjusted retention times and a cubic interpolation directly using the uncorrected retention times without dead time correction. The two methods were applied to two types of columns. The first group includes eight packed columns (seven OV polymethylphenylsiloxane and Apolane‐87 stationary phases), while the second includes five glass capillary columns (four methyl‐silicons with different film thicknesses and Apolane‐87 stationary phases). The retention indices obtained with a multiparametric and a cubic interpolation methods were compared with each other and with those calculated by Grobler's, Guardino's, Kaiser's and Kovàts' methods. The influence of coating, film thickness, and temperature on them was investigated.