Ion chromatography on a latex-coated silica monolith column
A silica monolith column (Merck Chromolith, 100 mm × 4.6 mm) has been coated with Dionex AS9-SC latex nanoparticles to convert the column into an anion-exchange stationary phase. For comparison purposes, a reversed-phase silica monolith was also converted into an anion-exchange column by coating wit...
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Veröffentlicht in: | Journal of Chromatography A 2007-06, Vol.1155 (1), p.8-14 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A silica monolith column (Merck Chromolith, 100
mm
×
4.6
mm) has been coated with Dionex AS9-SC latex nanoparticles to convert the column into an anion-exchange stationary phase. For comparison purposes, a reversed-phase silica monolith was also converted into an anion-exchange column by coating with the cationic surfactant didodecyldimethylammonium bromide (DDAB). Separations of common inorganic anions were carried out using 7.5 or 5.0
mM 4-hydroxybenzoic acid at pH 7.0 along with suppressed conductivity detection. Direct comparisons were then made between the two columns in terms of selectivity, efficiency and stability. The latex-coated column was on average 50% more efficient than the DDAB-coated column. A 10% decrease in retention times was observed on the DDAB column over 11
h of continuous eluent flow, while the latex coating exhibited |
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ISSN: | 0021-9673 |
DOI: | 10.1016/j.chroma.2007.01.098 |