ABSTRACT
Orav et al. [62] studied quantitatively the effect of adsorption of compounds of different homologous series (n-alkanes, n-alkenes, n-alkylcyclohexanes, arenes, alkanones) on capillary stainless-steel columns with different contents of polycyanopropylphenylmethyl silicone (OV-225) and polyethylene glycol (PEG-20M) on relative retention. Equations like Eqs. (9) and (12) govern experimental data on retention. This allows the estimation of the contribution of adsorption to the relative retention (see Table 4 [62]). As follows from the table, among the compounds studies, n-alkanes make the maximum contribution of adsorption to the relative retention (up to 30%) on PEG-20M with a thin stationary liquid-phase film. On the less polar silicone phase (OV-225), the effect of adsorption of n-alkanes and alkenes is lower that on PEG-20M ("' 0.2-6.0%).
