Ionic liquids (IL), i.e., organic salts with a melting point below or about room temperature (< 100 °C), have been widely used in analytical chemistry in last decades . IL are stable, nonvolatile, and liquid in a wide temperature range. Some IL form stable thin films. This makes it possible to use them as liquid stationary phases (SP) for gas chromatography (GC). In this case, IL demonstrate high polarity simultaneously with excellent thermal stability . IL are widely used for the separation of various mixtures . The selectivity and retention behavior of various IL were reviewed by Yao et al. . Various IL are used as gas chromatographic SP: for instance, derivatives of imidazolium, phosphonium, pyridinium, and guanidinium can be employed . The structures of various IL-based SP are reviewed in Ref. . Several types of IL-based GC columns are commercially distributed by Supelco (owned by Merck Group). These columns are used for various separations .