1. Hg(II) trace electrochemical detection on gold electrode: Evidence for chloride adsorption as the responsible for the broad baseline
- Author
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Philippe Behra, David Evrard, Laure Laffont, Pierre Gros, Teddy Hezard, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National de la Recherche Agronomique - INRA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Fondation de Coopération Scientifique Science Technique Aéronautique et Espace - FCS STAE (FRANCE), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Laboratoire de Chimie Agro-Industrielle (LCA), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Toulouse, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Chimie Agro-Industrielle (CAI), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole nationale supérieure des ingénieurs en arts chimiques et technologiques-Institut National de la Recherche Agronomique (INRA), and STAE (Sciences et Technologies pour l’Aéronautique et l’Espace) Foundation under the ‘‘MAISOE’’ (Microlaboratoires d’Analyses In Situ pour des observatoires Environnementaux) project
- Subjects
General Chemical Engineering ,Inorganic chemistry ,Gold electrode reactivity ,Analytical chemistry ,Halide ,Hg(II) trace electrochemical detection ,02 engineering and technology ,01 natural sciences ,Chloride ,Analytical Chemistry ,Adsorption ,Desorption ,Electrochemistry ,medicine ,Bovine serum albumin ,Cl adsorption ,Deposition (law) ,biology ,Chemistry ,010401 analytical chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,Calomel ,Electrode ,biology.protein ,Crystallite ,0210 nano-technology ,medicine.drug ,Chimie théorique et/ou physique - Abstract
yadsorption a b s t r a c t Investigations were performed in order to clarify the origin of the broad baseline observed during Hg(II) trace electrochemical detection on gold electrode in the presence of Cl y anions. The influence of Cl y concentration on the shape of the voltammograms was studied in the presence and in the absence of Bovine Serum Albumin (BSA) in order to bring out adsorption/desorption processes. On the basis of these experiments, and contrary to what has been proposed by several authors in the literature, it was proved that the broad baseline does not result from calomel (Hg2Cl2) formation but is rather related to an interaction between Cl y and polycrystalline Au electrode surface. The evolution of the shape of the baseline was also studied in the presence of other halide anions, namely F y , Br y , and I y . The latter two were found to induce a broad baseline similar to that recorded in the presence of Cl y . Finally, it was shown that BSA addition is not suitable for Hg(II) detection since it prevents Hg(0) deposition onto the electrode surface.
- Published
- 2013
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