COMBINATION OF FRONTAL AND ELUTION TECHNIQUES FOR DETERMINATION OF LOW-MOLECULAR-WEIGHT IMPURITIES IN GAS-ADSORPTION CHROMATOGRAPHY WITH OPEN-TUBULAR COLUMNS

A method was proposed for concentration and determination of low-molec ular-weight hydrocarbon impurities in hydrocarbon gases using an adsor ption open tubular column. It was shown that the relative peak heights of impurities depend linearly on their concentration in the test mixt ure, and that the chromatographic efficiency increases somewhat with a n increase in the sample volume. When the frontal-elution concentratio n technique was applied to heavier impurities, (using the determinatio n of hydrocarbon impurities in helium as an example) stepwise chromato graphy of impurities was accomplished.