Abstract
The chromatographic properties of stationary phases, stearic acid modified ceria-zirconia (SA‒CeO2‒ZrO2), alkylphosphonic acid modified ceria-zirconia (PA‒CeO2‒ZrO2), and alkylphosphonic acid modified magnesia-zirconia (PA‒ MgO‒ZrO2), have been investigated by reversed-phase high-performance liquid chromatography with polycyclic aromatic hydrocarbons (PAHs) and some basic compounds as probes. The retention of PAHs was quasi-homoenergetic on the three stationary phases with methanol/water as mobile phases. The retention of basic solutes was investigated on the three stationary phases over a wide range of pHs. They behave as reversed-phase packing materials at pH10.0. However, PA‒CeO2‒ZrO2 and PA‒MgO‒ZrO2 exhibited dual retention mechanism at pH 4.0. These results strongly suggest that the cation-exchange sites result from the ligand of alkylphosphonic acid, rather than from the mixed oxide supports.
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