AN APPROACH TO THE THEORY OF LINEAR DENSITY PROGRAMMING IN SUPERCRITICAL-FLUID CHROMATOGRAPHY

In the analysis of complex mixtures by supercritical fluid chromatography density programming is usually needed. The retention characteristics under linear density programming was investigated in this paper. Based on the capillary column model, the retention value and height equivalent to a theoretical plate equation have been derived as follows. [GRAPHICS] where [GRAPHICS] where [GRAPHICS] The derived equation of retention value has been verified by experimental results using capillary and micro-packed columns at different operating conditions.