Synergistic effects in mixed gas chromatographic stationary phases consisting of dibenzo-18-crown-6 and MPBHpB

The synergistic effect is investigated in mixed gas chromatographic stationary phases containing dibenzo-18-crown-6 + MPBHpB [o-methyl-p-phenylene-bis-(p-heptoxy benzoate)], with benzene/cyclohexane, cyclohexane/hexane, halogenated hydrocarbons, aromatics, ketones, phenols, alcohols and aniline derivatives as sample compound pairs. Some of the separations reveal positive or negative synergistic effect. This effect depends on the temperature, the mixing ratio and the linear velocity of the carrier gas.