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Retention behaviour of strong acid anions in ion-exclusion chromatography on sulfonate and carboxylate stationary phases

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O'Reilly, JW and Doble, P and Tanaka, K and Haddad, PR (2000) Retention behaviour of strong acid anions in ion-exclusion chromatography on sulfonate and carboxylate stationary phases. Journal of Chromatography A, 884 (1-2). pp. 61-74. ISSN 0021-9673

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Abstract

Some factors influencing the retention of strong-acid anions on ion-exclusion columns were investigated using columns with sulfonate and carboxylate functional groups. The nature of the functional group on the resin, the eluent pH and the eluent ionic strength all significantly affected the retention and separation of these analytes. Retention was observed for all strong-acid anions over the eluent pH range 2.2–5.7 and increased with both decreasing eluent pH and increasing eluent ionic strength. Some separation of strong-acid anions was possible when using a resin with carboxylate functional groups. It has also been demonstrated that strong-acid anions are poor markers of column void volume for ion-exclusion chromatography. A more accurate value was obtained using the neutral polymeric material dextran blue. When using eluents of low ionic strength, poor or fronted peak shapes were observed. A mechanism for these observations is proposed that relates the shape to ionic strength changes across the peak. A system peak was encountered under most experimental conditions. The properties of this peak are discussed and a cause for the system peak postulated.

Item Type: Article
Keywords: Inorganic anions; Organic acids; Strong acids; Retention mechanisms
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 61-74
ISSN: 0021-9673
Identification Number - DOI: 10.1016/S0021-9673(99)01312-6
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 31 Oct 2008 05:54
Last Modified: 18 Nov 2014 03:52
URI: http://eprints.utas.edu.au/id/eprint/7924
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