Integrated Microanalytical System for Simultaneous Voltammetric Measurements of Free Metal Ion Concentrations in Natural Waters

Article Article scientifique Article Integrated Microanalytical System for Simultaneous Voltammetric Measurements of Free Metal Ion Concentrations in Natural Waters eng 2006 author Noel Stéphane 134084 author Tercier Waeber Marie-Louise 0000-0002-5984-7930 22565 author Lin Lin 541803 author Buffle Jacques 24673 author Guenat Olivier author Koudelka-Hep Milena 2061-2069 10.1002/elan.200503632 1040-0397 A complexing gel integrated microelectrode (CGIME) for direct measurements of free metal ion concentrations in natural waters has been developed. It is prepared by the successive deposition of microlayers of a chelating resin, an antifouling agarose gel and Hg on a 100-interconnected Ir-based microelectrode array. The trace metals of interest are in a first step accumulated on the chelating resin in proportion to their free ion concentration in solution, then released in acidic solution and detected simultaneously by using square wave anodic stripping voltammetry (SWASV). The reliability of this sensor for the simultaneous measurement of copper, lead and cadmium has been studied by a series of replicate laboratory tests. The proportionality between the voltammetric peak current intensity and the free metal ion concentrations in solution has been demonstrated by using malonate as a model ligand. Finally, the CGIME sensor was applied to the Cu and Pb free concentration measurement in sea water samples and the results compared to the free metal ion concentrations measured using hollow fiber based permeation liquid membrane (HF-PLM) coupled to inductively coupled plasma mass spectrophotometer (ICP-MS). Comparable concentration values were found for both metals with both techniques allowing to validate the CGIME measurements in complex media. Metal speciation Free metal ions Microsensor array Microanalytical system Square wave voltammetry Environmental analysis Natural waters Dewey 540 40 Département de chimie minérale, analytique et appliquée 145 false Electroanalysis 18 21 da8fe98a-d3f4-4e67-8d37-46743f4688e3 Article (Published version) Restricted S.Noel.pdf 243966 application/pdf restrictedAccess Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée

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Integrated Microanalytical System for Simultaneous Voltammetric Measurements of Free Metal Ion Concentrations in Natural Waters	Electroanalysis			2006	550	0

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