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Determination of monovalent inorganic anions in high-ionic-strength samples by electrostatic ion chromatography with suppressed conductometric detection

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Hu, W and Haddad, PR and Tanaka, K and Sato, S and Mori, M and Xu, Q and Ikedo, M and Tanaka, S (2004) Determination of monovalent inorganic anions in high-ionic-strength samples by electrostatic ion chromatography with suppressed conductometric detection. Journal of Chromatography A, 1039 (1-2). pp. 59-62. ISSN 0021-9673

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Abstract

A new ion chromatographic (IC) system has been established by using micelles of 3-(N,N-dimethylmyristylammonio)propanesulfonate (Zwittergent 3–14) loaded onto a reversed-phase packed column as the separation column with an electronic rotary switching valve packed-bed suppressor for conductometric detection of inorganic anions. An aqueous H3BO3–Na2B4O7 solution has been demonstrated to be the most desirable eluent for this IC system. The relationship between retention time and the concentration of the borate eluent was determined for a series of model anionic analytes and this relationship was found to be opposite to that exhibited in a conventional anion-exchange IC system. The rapid elution and complete separation of monovalent inorganic anions were obtained by initially using a high-concentration borate solution as the eluent for a short-period, and then switching to a lower-concentration borate eluent to complete the separation. Detection limits for nitrite, bromide, nitrate, and chlorate were 0.85, 0.88, 0.95 and 4.8 μM, respectively, when a 7.0 mM Na2B4O7 eluent was used. Moreover, the ability to directly detect these monovalent anions in samples containing high concentrations of sulfate and/or chloride ions provided a major advantage of this approach.

Item Type: Article
Keywords: Electrostatic ion chromatography; Inorganic anions
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 59-62
ISSN: 0021-9673
Identification Number - DOI: 10.1016/j.chroma.2004.01.069
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 10 Oct 2008 05:32
Last Modified: 18 Nov 2014 03:51
URI: http://eprints.utas.edu.au/id/eprint/7700
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