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Retention of alkali, alkaline earth and transition metals on an itaconic acid cation-exchange column Eluent pH, ionic strength and temperature effects upon selectivity

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Bashir, W and Tyrrell, EC and Feeney, O and Paull, B (2002) Retention of alkali, alkaline earth and transition metals on an itaconic acid cation-exchange column Eluent pH, ionic strength and temperature effects upon selectivity. Journal of Chromatography A, 964 (1-2). pp. 113-122. ISSN 0021-9673

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Abstract

The unusual selectivity of a methylene succinic (itaconic) acid modified polymeric column was investigated for the separation of alkali, alkaline earth, transition and heavy metals employing non-chelating inorganic eluents. The retention of selected metal ions on the column was investigated with simple HNO3 eluents and eluents prepared from KNO3 and KCl salts of varying pH (adjusted using HNO3). From these studies both the effect of eluent ionic strength and pH upon retention was evaluated for the itaconic acid stationary phase. The results obtained showed that despite slow exchange kinetics causing poor efficiencies, acceptable baseline separations of selected alkaline earth and transitions could be obtained under optimum conditions (the baseline separation of Mg(II), Ca(II), Mn(II), Cd(II), Zn(II) and Co(II) was possible using a 15 mM KNO3–5 mM KCl eluent at pH 3.50 in under 25 min). The use of an simple ionic strength step gradient was shown that facilitated the addition of Pb(II) to the above group of metal ions. An investigation into the effect of temperature upon peak efficiency and retention showed increased column temperature could be used to improve the resolution of closely eluting metal ions such as Ca(II) and Sr(II) and Ca(II) and Mn(II).

Item Type: Article
Keywords: Itaconic acid; Metal cations; Alkali metals; Alkaline earth metals; Transition metals; Stationary phases, LC; pH effects; Temperature effects; Ionic strength; Selectivity
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 113-122
ISSN: 0021-9673
Identification Number - DOI: 10.1016/S0021-9673(02)00652-0
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 30 Oct 2008 08:24
Last Modified: 18 Nov 2014 03:52
URI: http://eprints.utas.edu.au/id/eprint/7892
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