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Fast ion chromatography of inorganic anions and cations on a lysine bonded porous silica monolith

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Sugrue, E and Nesterenko, PN and Paull, B (2005) Fast ion chromatography of inorganic anions and cations on a lysine bonded porous silica monolith. Journal of Chromatography A, 1075 (1-2). pp. 167-175. ISSN 0021-9673

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Abstract

A 0.46 cm × 10.0 cm silica monolith column was modified through the in situ covalent attachment of lysine (2,6-diaminohexanoic acid) groups. Due to the zwitterionic nature of the resultant stationary phase, the modified monolithic column contained both cation and anion exchange capacity. In the case of cation exchange, the capacity was found to be relatively low at between 5 and 6.5 μmoles Me2+ per column. However, as expected, the lysine monolith exhibited a higher anion exchange capacity at 12–13 μmoles A− per column (at pH 3.0), which was found to be dependent upon column pH, due to the dissociation of the weak acid carboxylic acid groups. High-performance separations of transition metal cations and inorganic anions were achieved using the modified monolith, with the effects of eluent concentration, pH and flow rate evaluated. Using elevated flow rates of up to 5 mL/min the separation of nitrite, bromate, bromide, nitrate, iodide and thiocyanate was possible in approximately 100 s with peak efficiencies of between 50 and 100,000 N/m and retention time %RSD of under 0.3%.

Item Type: Article
Keywords: Monolithic silica; Lysine; Cations; Anions; Ion chromatography
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 167-175
ISSN: 0021-9673
Identification Number - DOI: 10.1016/j.chroma.2005.03.126
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 16 Sep 2008 22:24
Last Modified: 18 Nov 2014 03:50
URI: http://eprints.utas.edu.au/id/eprint/7588
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