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Vol. 27, Special Issue, May 2014, pp. 258-263

 

Bullet

 

Development of Li+ Selective Microelectrode Using PPy [3,3'-Co(1,2-C2B9H11)2] as a Solid Contact
 

1, 2 Safae MERZOUK, 1 Nadia ZINE, 2 Mohamed AGOUZOUL, 3 Mourad TAHA JANAN, 4 Joan BAUSELLS, 5 F. Teixidor,
1
Nicole Jaffrezic-Renault, 1 Abdelhamid ERRACHID

1Université Claude Bernard Lyon 1, Institut des Sciences Analytiques, Département LSA, Equipe SIMS (Surfaces (bio)-Interfaces Micro/nano Systémes), 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 Microelectrònica (IMB-CSIC), Campus U.A.B., 08193 Bellaterra, Spain
5 Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, 08193 Bellaterra, Spain
Tel.: +33 437 42 35 69,

E-mail: safae_merzouk@yahoo.fr

 

Received: 31 December 2012 /Accepted: 10 August 2013 /Published: 26 May 2014

Digital Sensors and Sensor Sysstems

 

Abstract: Planar all solid-contact ion-selective microelectrodes (ASC-µISEs) with a conducting polymer (polypyrrole doped with cobaltabis(dicarbollide) anion [3,3'-Co(1,2-C2B9H11)2]) as a solid contact layer between the polymeric membrane sensitive to lithium (Li) and the gold (Au) substrate were prepared and investigated. The N,N-dicyclohexyl-N',N'-diisobutylyl-cis-cyclohexane-1,2- dicarboxamide (ETH 1810) was used as ionophore for Li recognition. The developed microelectrodes show a linear response for Li+ concentration between 6´10-5 M and 1´10-1 M with slope of 53±1 mV per decade and exhibits remarkably enhanced selectivity for Li over other cations. The calibration plots using artificial serum containing three different levels of sodium chloride (NaCl) (135, 145 and 155 mM) as a background electrolyte were shown a linear response with a slope of 50 mV per decade in the clinical range of interest (0.7-1.5´10-3 M Li+). The developed microelectrodes will be used to determine Li+ concentrations in serum samples of manic-depressive patients under Li treatment.

 

Keywords: Lithium-selective, All solid-contact ion-selective microelectrode, PPy [3,3'-Co(1,2-C2B9H11)2], Potentiometry.

 

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