Influence of a water vapor admixture in the carrier gas on capacity coefficients of polar organic compounds

The influence of a water vapor admixture in helium, nitrogen, and carbon di oxide on capacity coefficients of C-3-C-5 alcohols and pyridine during chro matography process in capillary columns with polar (PEG-20M) and nonpolar ( SE-30) stationary phases was studied. The introduction of a water admixture into the carrier gas increases the capacity coefficient of polar organic c ompounds on the capillary column with PEG-20M and has almost no effect on t his value in the case of SE-30. The change in retention of polar organic co mpounds on the capillary column with the PEG-20M polar phase occurs due to a change in the properties of the stationary phase when it adsorbs water fr om the mobile phase.