%0 Journal Article
%T Electronic Tongue for Qualitative Analysis of Aqueous Solutions of Salts Using Thick-film Technology and Metal Electrodes
%A Luis Gil
%A Eduardo Garcia-Breijo
%A Javier Iba£¿ez
%A Roberto H. Labrador
%A Eduard Llobet
%A Ram¨®n Mart¨ªnez-M¨¢£¿ez
%A Juan Soto
%J Sensors
%D 2006
%I MDPI AG
%R 10.3390/s6091128
%X An electronic tongue for the qualitative analysis of aqueous solutions of salts hasbeen developed. The following set of electrodes was used: RuO2, Ag, and Cu in thick-filmtechnology and Au, Pb, Zn and Ni as small bars of the corresponding metal. The response ofthe designed ¡°electronic tongue¡± was tested on a family of samples containing pure salt andcomplex mixtures. The electrodes were used as potentiometric un-specific sensors and thee.m.f. of each electrode in contact with a certain aqueous solution was used as input signalfor a PCA analysis. The study showed that the set of electrodes were capable to discriminatebetween aqueous solutions of salts basically by their different content in anions and cations(the anions SO42-, Cl-, PO4H2-, CO3H-, NO3- and cations Na+ and K+ were studied). In orderto better analyze the basis for the discrimination power shown by the electronic tongue, aquantitative analysis was also envisaged. A fair estimation of the concentrations of thedifferent ions in the solutions studied appeared to be possible using this electronic tonguedesign.Keywords:
%K Electronic tongue
%K thick-film technology
%K metal electrodes
%K water discrimination.
%U http://www.mdpi.com/1424-8220/6/9/1128