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Kovats coefficients (KP c ) and molecular structural coefficients (SP ci ), as well as their dependences on column temperature, stationary phase polarity, and solute chemical nature, have been dealt with in some earlier papers. Three new polarity values based on the above parameters are presented to characterize gas-liquid chromatographic stationary phases: the substance-specific polarity factor, the average polarity factor, and its derived polarity. The new scales describe the interaction capacity of 26 stationary phases from squalane (retention polarity, 0) to bis(cyanoethoxy)formamide (retention polarity, 144.6) with the first five McReynolds solutes. Their physicochemical meanings are also shown.

Substance-Specific and Average Polarity Factors for Characterization of Stationary Phases Used in Gas--Liquid Chromatography