Response characteristics of a potentiometric detector with a copper metal electrode for flow-injection and chromatographic determinations of metal ions |
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| Authors: | Peter W Alexander Paul R Haddad Marek Trojanowicz |
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| Institution: | Department of Analytical Chemistry University of New South Wales, P.O. Box 1, Kensington, N.S.W. 2033 Australia;Department of Chemistry, University of Warsaw Poland |
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| Abstract: | The potentiometric response characteristics of a copper metal indicator electrode are reported in a flow-injection system when metal ions are injected into ligands of differing complexing strengths in buffered carrier streams. Theoretical Nernstian derivation of equations relating peak heights to both the injected metal ion concentration and the ligand concentration are shown to give good agreement with experimental peak height measurements for Ca2+, Al3+, Pb2+, Cd2+, Co2+, Cu2+, Ni2+, Mn2+, Zn2+ and UO2+2. A study of injections into buffered ligand streams containing EDTA, ethylenediamine, triethylenetetramine, iminodiacetate, citrate, or glutamate shows advantages for the use of the more weakly complexing ligands in the carrier stream. Linear response are obtained at low (10?3–10?4 M) metal ion concentrations over narrow ranges. Some chromatographic applications are outlined. |
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