In this paper, the mass balance model relating to column pressure was set up, which based the original mass balance model, and taken into the relationship between the pressure change and carrier gas speed in the column. The first moment, the second and third central moments for the new model were derived by Laplace transform. The theoretical results showed that the column inlet pressure effects the peak profile and column efficiency. There is an approximate linear relationship among the column inlet pressure, the retention time of solvent, and the half peak width. These subsequences were proved experimentally.

Key words: GAS CHROMATOGRAPHY, MOMENTS, ELUTION CURVE