MIXED RETENTION MECHANISMS IN GAS-LIQUID-CHROMATOGRAPHY .1. RELATION BETWEEN RETENTION VOLUME AND SAMPLE-SIZE - DETERMINATION OF BULK LIQUID CONTRIBUTION

An equation is proposed in which the retention volume in gas chromatography is expressed as a function of sample size when both bulk partition and surface adsorption contribute to the retention. The adsorption is assumed to vary with sample size, and the partition coefficient is assumed to be constant. The equation was fitted to experimental data for ethyl methyl ketone and diisopropyl ether on n-octadecane columns of various loadings. With this method, the contributions to the retention volume from bulk solution and adsorption could be separately determined, using data from only one column. © 1979.