Comparison of the acidity of residual silanol groups in several liquid chromatography columns

Comparison of the acidity of residual silanol groups in several liquid chromatography columns

The silanol acidity of Waters Resolve C 18, Waters Resolve silica, Waters Symmetry C 18, Waters Symmetry silica, Waters XTerra MS C 18 and underivatized XTerra columns has been measured from the retention of LiNO 3 with a methanol/water (60:40) mobile phase buffered to different pH values. The Li +...

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Veröffentlicht in:Journal of Chromatography A 2003-01, Vol.986 (1), p.33-44
Hauptverfasser: Méndez, Alberto, Bosch, Elisabeth, Rosés, Martı́, Neue, Uwe D
Format: Artikel
Sprache:eng
Schlagworte:
Acids
Analytical chemistry
Chemistry
Chromatographic methods and physical methods associated with chromatography
Chromatography, Liquid - instrumentation
Exact sciences and technology
Hydrogen-Ion Concentration
Other chromatographic methods
Silanes - chemistry
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Zusammenfassung:The silanol acidity of Waters Resolve C 18, Waters Resolve silica, Waters Symmetry C 18, Waters Symmetry silica, Waters XTerra MS C 18 and underivatized XTerra columns has been measured from the retention of LiNO 3 with a methanol/water (60:40) mobile phase buffered to different pH values. The Li + cation is retained by cationic exchange with the background cation of the mobile phase (Na +) through the ionized silanols. The number of active silanols increases in the order: XTerra MS C 18≪Symmetry C 18
ISSN:0021-9673
DOI:10.1016/S0021-9673(02)01899-X