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The gas chromatographic separations of aromatic compounds using special mixed sta-tionary phases consisting of pp-p-CD+AgNO3, pp-p-CD+TlNO3, pp-β-CD+di-n-butly phthalate,pp-p-CD+BPBHpB liquid crystalline, and bentone-34+AgNO3 were investigated. Besides pp-β-CD+di-n-butyl phthalate, most of the separations deviated from the additivity and a synergisticeffect was observed. The separation effects depend on the temperature and how mixing is accom-plished.