Characterization of Chemically Bonded Alumina Beads Prepared with β-Phenethyltrichlorosilane as Column Packings in Gas Chromatography

Abstract

A chemically bonded phase was prepared from alumina by modifying with β-phenethyltrichlorosilane. The amounts of surface-bonded β-phenethyl groups were easily controlled by adjusting the initial amount of the silane upon reaction. Using a column packed with chemically bonded alumina, some aliphatic hydrocarbons, benzene and t-butyl methyl ether were eluted as symmetric or slightly skewed peaks. Increasing the number of surface-bonded, β-phenethyl groups decreased the reduced retention volume of a given solute with improved peak shape and linearly reduced the specific surface area of the chemically bonded alumina. The mixed retention mechanism was used for understanding this dependence of the reduced retention volume and the specific surface area upon the amount of surface-bonded β-phenethyl groups.