Abstract
In this work, we present the excess isotherm of acetonitrile for stationary phases with different coverage density. Data obtained with the minor disturbance method were compared with 29Si cross-polarization/magic-angle spinning NMR spectra to find dependence between acetonitrile adsorption on C18 chemically bonded stationary phases and coverage density of stationary phase. The preferential adsorption of acetonitrile on the bonded phase and the adsorption of water on the silica surface can be well correlated with the coverage density.
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