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Manipulation of separation selectivity of inorganic anions in electrostatic ion chromatography by the use of mixed cationic–zwitterionic micelles as the column coating solution

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Hu, W and Haddad, PR and Cook, HA and Yamamoto, H and Hasebe, K and Tanaka, K and Fritz, JS (2001) Manipulation of separation selectivity of inorganic anions in electrostatic ion chromatography by the use of mixed cationic–zwitterionic micelles as the column coating solution. Journal of Chromatography A, 920 (1-2). pp. 95-100. ISSN 0021-9673

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Abstract

This paper describes an electrostatic ion chromatographic system in which the separation selectivity for inorganic anions, especially for sulfate and phosphate, could be manipulated by altering the molar ratio of the zwitterionic and cationic surfactants in the column coating solution used to prepare the stationary phase. The zwitterionic surfactant used for this study was 3-(N,N-dimethyltetradecylammonio)propanesulfonate (Zwittergent-3-14) and the cationic surfactant was tetradecyltrimethylammonium (TTA). Using a reversed-phase C18 column (250×4.6 mm I.D.) coated with 10/10 (mM/mM) of TTA/Zwittergent-3-14 mixed micelles as the stationary phase and either NaHCO3 or Na2CO3 aqueous solution as the eluent, together with suppressed conductivity detection, baseline separation of seven model inorganic anions was obtained. The elution order for those anions was found to be F−<HPO42−<Cl−<SO42−<NO2−<Br−<NO3−. Under the same conditions but using 1/10 (mM/mM) of TTA/Zwittergent-3-14 mixed micelles as the column coating solution, the elution order for these model ions was F−<HPO42−<SO42−<Cl−<NO2−<Br−<NO3−. The early elution of phosphate and sulfate is a unique attribute of this system. Detection limits for F−, HPO42−, Cl−, SO42−, NO2−, Br− and NO3− (S/N=3, sample injection volume 100 μl) were 0.11, 0.12, 0.12, 0.18, 0.49, 0.49, 0.52 μM, respectively.

Item Type: Article
Keywords: Inorganic anions; Micelles; Electrostatic ion chromatography; Ion chromatography; Stationary phases, LC; Selectivity; Coated columns
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 95-100
ISSN: 0021-9673
Identification Number - DOI: 10.1016/S0021-9673(01)00534-9
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 29 Oct 2008 00:43
Last Modified: 18 Nov 2014 03:52
URI: http://eprints.utas.edu.au/id/eprint/7853
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