| Numéro |
J. Phys. IV France
Volume 107, May 2003
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|
|---|---|---|
| Page(s) | 965 - 968 | |
| DOI | https://doi.org/10.1051/jp4:20030459 | |
J. Phys. IV France 107 (2003) 965
DOI: 10.1051/jp4:20030459
Complexing gel integrated microelectrode arrays for direct detection of free metal ion concentrations in natural waters
S. Noël, M.-L. Tercier-Waeber, L. Lin and J. BuffleCABE, Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences Il, 30 quai E.-Ansermet, 1211 Geneva 4, Switzerland
Abstract
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.
© EDP Sciences 2003