J. Phys. IV France 107 (2003) 965
Complexing gel integrated microelectrode arrays for direct detection of free metal ion concentrations in natural watersS. Noël, M.-L. Tercier-Waeber, L. Lin and J. Buffle
CABE, Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences Il, 30 quai E.-Ansermet, 1211 Geneva 4, Switzerland
A novel Complexing Gel Integrated Microelectrode (CGIME) for direct measurements of free metal ion concentrations in natural waters has been developed. It is prepared by successive deposition of a chelating resin, antifouling agarose gel and the Hg layers on an 100-interconnected Ir-based microelectrode array. Reliability of trace metal accumulation on the chelating resin and their release in acidic media and detection using Square Wave Anodic Stripping Voltammetry bas been demonstrated by a series of replicate laboratory tests. Finally, the CGIME sensor has been applied to the Cu and Pb free metal concentration measurements in sea water samples. The CGIME results were comparable with those of free metal ion concentration measurements performed using Hollow Fiber Permeation Liquid Membrane (HF-PLM). Similar concentration values were found for both metals with both techniques which validate CGIME measurements.
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