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Issue 20, 2011
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Direct determination of free metal concentration by implementing stripping chronopotentiometry as the second stage of AGNES

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Abstract

The electroanalytical technique Absence of Gradients and Nernstian Equilibrium Stripping (AGNES) has been extended by applying stripping chronopotentiometry (SCP) as the re-oxidation stage in the determination of the free concentration of Zn2+, Cd2+ and Pb2+. This new approach, called AGNES-SCP, has been implemented with screen-printed electrodes (SPE) and the standard Hanging Mercury Drop Electrode (HMDE). Clear advantages of this variant have been shown: (i) the easy resolution of the peaks of different metals present in mixtures and (ii) the sparing of blanks. A rigorous computation of the faradaic charge along the SCP stage takes into account the contribution of other oxidants, which can be efficiently measured at the end of the deposition stage of AGNES. The free Cd concentration determined in an oxalate solution at pH 6 with an HMDE as the working electrode agreed well with values obtained with a Cd Ion Selective Electrode. The free metal concentration measured using an SPE for the system Cd and nitrilotriacetic acid (NTA) at pH = 4.8 also conformed well with Visual MINTEQ results.

Graphical abstract: Direct determination of free metal concentration by implementing stripping chronopotentiometry as the second stage of AGNES

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Publication details

The article was received on 10 Jun 2011, accepted on 26 Jul 2011 and first published on 30 Aug 2011


Article type: Paper
DOI: 10.1039/C1AN15481H
Citation: Analyst, 2011,136, 4337-4343
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    Direct determination of free metal concentration by implementing stripping chronopotentiometry as the second stage of AGNES

    C. Parat, L. Authier, D. Aguilar, E. Companys, J. Puy, J. Galceran and M. Potin-Gautier, Analyst, 2011, 136, 4337
    DOI: 10.1039/C1AN15481H

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