Abstract
The kinetics of sorption—desorption in an octadecylsilica, ion pairing chromatographic system have been directly measured for the first time, via the pressure-jump relaxation kinetics method. The sorption rate constant was found to be 1.4 · 10 9 1/mol s. The rates of sorption—desorption were found to correlate with differences in the chromatographic efficiency of the stationary phase studied, with more efficient phases showing more rapid sorption—desorption equilibration times. This indicates that, at least for the systems studied here, that the dynamics of the primary sorption—desorption process play a significant role in determining the performance of the octadecylsilicas as liquid chromatographic stationary phases.
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