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Sensors 2006, 6(9), 1128-1138; doi:10.3390/s6091128
Article

Electronic Tongue for Qualitative Analysis of Aqueous Solutions of Salts Using Thick-film Technology and Metal Electrodes

1,* , 1, 1, 2, 3
,
2 and 2
1 Instituto de Química Molecular Aplicada and Grupo de Microelectrónica Híbrida, Departamento de Ingeniería Electrónica, Universidad Politécnica de Valencia, Camino de Vera s/n, 46021, Valencia, Spain 2 Instituto de Química Molecular Aplicada and Departamento de Química, Universidad Politécnica de Valencia, Camino de Vera s/n, 46021, Valencia, Spain. 3 MINOS, Department of Electronic Engineering, University Rovira i Virgili, Avda. Països Catalans, 26, 43007 Tarragona, Spain
* Author to whom correspondence should be addressed.
Received: 17 May 2006 / Accepted: 26 June 2006 / Published: 25 September 2006
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Abstract

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:
Keywords: Electronic tongue; thick-film technology; metal electrodes; water discrimination. Electronic tongue; thick-film technology; metal electrodes; water discrimination.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Gil, L.; Garcia-Breijo, E.; Ibañez, J.; Labrador, R.H.; Llobet, E.; Martínez-Máñez, R.; Soto, J. Electronic Tongue for Qualitative Analysis of Aqueous Solutions of Salts Using Thick-film Technology and Metal Electrodes. Sensors 2006, 6, 1128-1138.

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