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Vol. 27, Special Issue, May 2014, pp. 264-268




Electrochemical Impedance Study of Li-µISE Based on PPy[LiClO4] as a Solid Contact

Abdelhamid ERRACHID, 1 Nadia ZINE

1 Institut des Sciences Analytiques (ISA), Université de Lyon, Université  de Claude Bernard Lyon 1, UMR 5280, 5 rue de la Doua, 69100 Villeurbanne, France
2 Université  Mohamed V Agdal, Ecole Mohammadia d’ingénieurs, Equipes de Recherche Modélisation et Multimédia Mécanique (ERD3M), BP 765, Agdal Rabat Maroc
3 Université Mohamed V Souissi, Ecole Normale Supérieure de l'Enseignement Technique, 10100, Rabat Maroc
4 Centre Nacional de Microelectrňnica (IMB-CSIC), Campus U.A.B., 08193 Bellaterra, Spain
Tel.: +33 437 42 35 69

E-mail: safae_merzouk@yahoo.fr, nadia.zine@univ-lyon1.fr


Received: 23 November 2013 /Accepted: 12 January 2014 /Published: 26 May 2014

Digital Sensors and Sensor Sysstems


Abstract: The development of ion-selective microelectrodes for monitoring lithium ions in blood or serum is very important in the field of clinical chemistry. For this interest, all-solid-state microsensors based on impedance measurement for the detection of Li+ has been developed. The selective PVC membrane composition used was obtained by dissolving 1.2 % (w/w) Lithium ionophore III, 66 % (w/w) o-nitrophenyloctyl ether, 0.4 % of (potassium tetrakis(4- chlorophenyl)borate and 32.4% (w/w) polyvinylchloride (PVC) in tetrahydrofuran (THF). Then, the selective membrane was deposited onto gold microelectrodes containing a conducting polymer (polypyrrole doped with Lithium perchlorate) as solid contact layer. The developed Li+-ISE provides excellent performance towards the determination of lithium with a low detection limit of 6´10-8 M and a wide linear range from 1´10-7 M to 1´10-1 M covering the clinically interesting of Lithium range (0.5´10-3 to 1.5´10-3 M); The selectivity properties have been examined obtaining good results.


Keywords: Ion-selective microelectrode (mISE), Conducting polymer, Electrochemical Impedance Spectroscopy, Lithium ion, Electropolymerization.


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