INVESTIGATION OF THE ROLE OF THE CARRIER GAS IN CAPILLARY GAS-SOLID CHROMATOGRAPHY

Nonideal interactions of the sorbate and the carrier gas and adsorptio n of the sorbate an the adsorbent surface in capillary gas-solid chrom atography were studied. Chromatographic retention was found to be larg ely determined by adsorption processes. With respect to the retention coefficients (capacity factors) of a sorbate (k) with different carrie r gases (P-1 and P-2), the correlation relationship k(P-2) = A . k(P-1 ) + B (A, B are parameters of the equation) is closely obeyed. The adv antages of carbon dioxide as the carrier gas were analyzed; the use of carbon dioxide allows the efficiency of the column to be enhanced.