Solute band broadening in 50 mum I.D. open tubular columns coated with
PS-264 stationary phase has been evaluated in supercritical fluid chr
omatography. An improved method for on-column measurements of stationa
ry phase swelling was used. For the conditions evaluated, a significan
t contribution to the total solute band broadening originating from st
ationary phase interactions was found. Possible sources of solute band
broadening in the stationary phase are discussed.