Abstract
The retention and selectivity behaviour of some aromatic hydrocarbons, parabens ( p-hydroxybenzoic acid esters) and nitrochlorobenzene compounds were studied by high-performance liquid chromatography on 24 kinds of phenyl-modified silica gels, prepared with xylene solution containing phenyldimethylchlorosilane (P), diphenylmethylchlorosilane (D), triphenylchlorosilane (T) or benzyldimethylchlorosilane (B), using six kinds of silica gel with various mean pore diameters and/or specific surface areas. From elemental analysis data for carbon, the maximum number of accessible phenyl surface groups per 100 Å 2 of silica gel (mean pore diameter 108 Å, specific surface area 333 m 2/g) in P, D, T and B gel was calculated to be 2.13, 1.90, 0.99 and 2.36, respectively. Using methanol—water mixtures as the eluent, aromatic hydrocarbons and parabens were separated on all the gels studied, but with different degrees of resolution. Nitrochlorobenzene compounds could not separated on the P, D and T gels, but were separated on B gel and also on an octadecylsilica column.
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