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Abstract

The presence of aluminium in the silica matrix causes an enhancement of the acidity of the silanol group on silica gel. Therefore, in order to prepare silica-based cation-exchangers for ion chromatography (IC) under strongly acidic eluent conditions, modification of silica gel with aluminium using a coating method was carried out. As a result, aluminium-adsorbing silica gels were found to act as a cation-exchangers under strongly acidic eluent conditions and were successfully applied to the conductimetric detection IC for the separation of common mono- and divalent cations using nitric acid–2,6-pyridinedicarboxylic acid eluent. These results strongly indicate that the modification is a simple and effective way for the preparation of advanced silica-based cation-exchangers for IC.

Item Type:	Article
Authors/Creators:	Ohta, K and Morikawa, H and Tanaka, K and Haddad, PR
Keywords:	Metal cations; Aluminium-modified silica; Silica; Stationary phases, LC
Journal or Publication Title:	Journal of Chromatography A
ISSN:	0021-9673
DOI / ID Number:	10.1016/S0021-9673(97)01248-X
Additional Information:	The definitive version is available at http://www.sciencedirect.com
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