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Flow-injection potentiometric determination of free cadmium ions with a cadmium ion-selective electrode |
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| Authors: | Marek Trojanowicz Peter W. Alexander D. Brynn Hibbert |
| Affiliation: | a Department of Chemistry, University of Warsaw, Pasteura 1 02-093 Warsaw Poland b Department of Physical Sciences, University of Tasmania, Launceston, PO Box 1241 Tasmania 7250 Australia c School of Chemistry, University of New South Wales Sydney Australia |
| Abstract: | The determination of free cadmium ions with solid-state cadmium ion-selective electrode can be performed in non-flow measurements in non-buffered solutions in a wide concentration range down to pCd 10. In cadmium ion buffered solutions linear Nernstian response was obtained even down to pCd 12, which is lower, that expected based on calculation of cadmium solubility from the conditional solubility product. Interferences of trace amounts of Fe(III), Cu(II) and Pb(II) commonly present in natural waters in larger concentrations than Cd(II) can be eliminated by reduction with hydroxylamine, complexation with Neocuproine and ion-exchange on anion-exchange resin in sulphate form, respectively. The developed procedure might be suitable for the determination of activity of free cadmium ions in natural water. A preliminary study on this subject is demonstrated for river water sample using stopped-flow flow-injection system. |
| Keywords: | Cadmium ion-selective electrode Flow-injection analysis Potentiometry Water analysis |
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