The influence of imperfection of mobile gas phase (connected with its
nature and pressure) on retention and widening of chromatographic band
s and also corresponding possibilities of govern the column selectivit
y as well as the resolution of solutes have been considered. The espec
ial attention is paid to the role of pressure and gas velocity gradien
ts including its spasmodic change in the case of coupled columns. The
possibilities of gradient barochromatography are pointed out for ident
ification of components of mixtures and also for working out the metho
ds of control of composition of various objects.