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Ion chromatographic separation of hydrogen ion and other common mono- and divalent cations


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Xu, Q, Mori, Masanobu, Tanaka, K, Hu, W and Haddad, PR 2004 , 'Ion chromatographic separation of hydrogen ion and other common mono- and divalent cations' , Journal of Chromatography A, vol. 1023, no. 2 , pp. 239-245 , doi: 10.1016/j.chroma.2003.10.017.

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We introduced an approach to the ion chromatographic determination of common mono- and divalent cations including hydrogen ion and demonstrated the ability of a C30 column dynamically coated first with dodecylsulfate and then with 18-crown-6 ether to separate the cations by ion-exchange mechanism. Using an ethylenediamine solution containing a small concentration of 18-crown-6 ether and lithium dodecylsulfate at pH 6.2 as eluent, the cations were eluted in the order Li+<Na+<NH4+<H+<K+<Mg2+<Ca2+ with symmetrical peaks. The conductivity vs. concentration plots were linear about three orders of magnitude, from millimolar to micromolar; and the detection limits were all <0.6 μM. Rainwater was analyzed directly using this ion chromatographic system with satisfactory results.

Item Type: Article
Authors/Creators:Xu, Q and Mori, Masanobu and Tanaka, K and Hu, W and Haddad, PR
Keywords: Water analysis; Stationary phases, LC; Rainwater; Acidity; Cations
Journal or Publication Title: Journal of Chromatography A
ISSN: 0021-9673
DOI / ID Number: 10.1016/j.chroma.2003.10.017
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