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Examination of the surface heterogeneity of reversed-phase packing materials with solvent adsorption

✍ Scribed by Péter Vajda; Szymon Bocian; Bogusław Buszewski; Attila Felinger

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
376 KB
Volume
33
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

The adsorption isotherms of acetonitrile, ethanol, 2‐propanol, and THF were measured using frontal analysis on six columns packed with octadecyl RP stationary phase. The effect of the bonding density of the end‐capped octadecyl bonded phase on the adsorption properties was measured. Adsorption isotherm data were collected from aqueous solutions of the four organic modifiers. The isotherm model for solvent adsorption was selected using two independent parameter estimation methods, the regression analysis and adsorption energy distribution. The fitted isotherm parameters were tested by modeling of overloaded elution bands with the aid of the equilibrium‐dispersive model of chromatography. The surface heterogeneity estimations and the effect of the silanol groups on the adsorption of solvents were based on those data.

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