The aim of this research was to investigate an influence of flow velocity on the main parameters (retention time, tailing factor, relative area and number of theoretical plates) of peaks belonging to volatile compounds in the GC-Flame ionization detector analysis. Our results showed that as the flow increases, the retention time declines significantly (p<0.01). The other above-mentioned parameters of peaks also change depending on the characteristics of the solvents. The obtained results provide a platform for increasing accuracy of impurity tests for many volatile compounds and development of novel methods of analysis.