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Selectivity behaviour of a bonded phosphonate–carboxylate polymeric ion exchanger for metal cations with varying eluent compositions


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Shaw, MJ and Nesterenko, PN and Dicinoski, GW and Haddad, PR (2003) Selectivity behaviour of a bonded phosphonate–carboxylate polymeric ion exchanger for metal cations with varying eluent compositions. Journal of Chromatography A, 997 (1-2). pp. 3-11. ISSN 0021-9673

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The chromatographic behaviour of a commercially available ion-exchange stationary phase (the Dionex IonPac CS12A column) is described for a wide range of transition and heavy metal ions with nitric acid eluents containing chloride and nitrate potassium salts. The separation selectivity was found to arise from simultaneous ion-exchange interactions and chelation with the attached carboxylic and phosphonic acid groups. These interactions were investigated by altering the ionic strength and pH of the eluent and also the column temperature. Strong affinity of the stationary phase towards heavy metal ions, in particular bismuth and the uranyl ion was observed at low pH under chelating ion-exchange conditions, with high efficiency separations of other ions including cadmium and lead being possible with short analysis times ( approx.5–15 min). Examples are given of separations obtained using 4-(2-pyridylazo)resorcinol or Arsenazo III as the post-column chromogenic reagents, demonstrating the potential versatility and utility of this stationary phase for heavy metal ion analysis.

Item Type: Article
Keywords: Metal cations; Maleic acid; Phosphonates; Mobile phase composition; Selectivity; Chelation; Ion exchangers
Journal or Publication Title: Journal of Chromatography A
Page Range: pp. 3-11
ISSN: 0021-9673
Identification Number - DOI: 10.1016/S0021-9673(03)00111-0
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Date Deposited: 13 Oct 2008 01:33
Last Modified: 18 Nov 2014 03:51
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