ABSTRACT
Many chromatographers have received data for which the nature of the surface of capillary walls has a significant effect on the retention. For example, the retention indexes of a capillary glass column (stationary liquid phase-squalane) and stainless-steel column are 640.8 and 642.2 for benezene, and 873.5 and 874.9 for a-xylene, respectively [50]. The differences in retention for the columns of different materials are equal to 1.4 IU for benzene and a-xylene. The important results were obtained by Schomburg et al. [51,52]. They found that retention indexes on squalane for two capillary columns (glass and stainless steel) for octene-3 differ by 4.9 units. The dependence of retention on the nature of the inner capillary column surface was also reported by Johansen and Ettre [53]. Important investigations on the role of adsorption in capillary gas-[liquid-solid] chromatography were conducted by Jennings [54].
