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Ion chromatographic determination of hydroxide ion on monolithic reversed-phase silica gel columns coated with nonionic and cationic surfactants

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Xu, Q and Mori, M and Tanaka, K and Ikedo, M and Hu, W and Haddad, PR (2004) Ion chromatographic determination of hydroxide ion on monolithic reversed-phase silica gel columns coated with nonionic and cationic surfactants. Journal of Chromatography A, 1041 (1-2). pp. 95-99. ISSN 0021-9673

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Abstract

The determination of hydroxide by ion chromatography (IC) is demonstrated using a monolithic octadecylsilyl (ODS)-silica gel column coated first with a nonionic surfactant (polyoxyethylene (POE)) and then with a cationic surfactant (cetyltrimethylammonium bromide (CTAB)). This stationary phase, when used in conjunction with a 10 mmol/l sodium sulfate eluent at pH 8.2, was found to be suitable for the rapid and efficient separation of hydroxide from some other anions, based on a conventional ion-exchange mechanism. The peak directions and detection responses for these ions were in agreement with their known limiting equivalent ionic conductance values. Under these conditions, a linear calibration plot was obtained for hydroxide ion over the range 16 μmol/l to 15 mmol/l, and the detection limit determined at a signal-to-noise ratio of 3 was 6.4 μmol/l. The double-coated stationary phase described above was shown to be superior to a single coating of cetyltrimethylammonium bromide alone, in terms of separation efficiency and stability of the stationary phase. A range of samples comprising solutions of some strong and weak bases was analyzed by the proposed method and the results obtained were in good agreement with those obtained by conventional potentiometric pH measurement.

Item Type: Article
Keywords: Monolithic columns; Stationary phases, LC; Coated columns; Hydroxide; Inorganic anions; Surfactants
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 95-99
ISSN: 0021-9673
Identification Number - DOI: 10.1016/j.chroma.2004.05.005
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 03 Oct 2008 02:18
Last Modified: 18 Nov 2014 03:51
URI: http://eprints.utas.edu.au/id/eprint/7684
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