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Sensors 2013, 13(10), 14064-14078; doi:10.3390/s131014064

An Electronic Tongue Designed to Detect Ammonium Nitrate in Aqueous Solutions

1 Centro de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universidad Politécnica de Valencia–Universidad de Valencia de Valéncia, Camino de Vera s/n, E-46022 Valencia, Spain 2 CIBER de Bioingeniería, Biomateriales y Nano medicina (CIBER-BBN), Bellaterra, E-08193 Barcelona, Spain 3 Departamento de Química. Universidad Politécnica de Valencia. Camino de Vera s/n., E-46022 Valencia, Spain 4 Departamento de Ingeniería Electrónica. Universidad Politécnica de Valencia, Camino de Vera, s/n. E-46022 Valencia, Spain
* Author to whom correspondence should be addressed.
Received: 20 August 2013 / Revised: 2 October 2013 / Accepted: 15 October 2013 / Published: 18 October 2013
(This article belongs to the Section Chemical Sensors)
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An electronic tongue has been developed to monitor the presence of ammonium nitrate in water. It is based on pulse voltammetry and consists of an array of eight working electrodes (Au; Pt; Rh; Ir; Cu; Co; Ag and Ni) encapsulated in a stainless steel cylinder. In a first step the electrochemical response of the different electrodes was studied in the presence of ammonium nitrate in water in order to further design the wave form used in the voltammetric tongue. The response of the electronic tongue was then tested in the presence of a set of 15 common inorganic salts; i.e.; NH4NO3; MgSO4; NH4Cl; NaCl; Na2CO3; (NH4)2SO4; MgCl2; Na3PO4; K2SO4; K2CO3; CaCl2; NaH2PO4; KCl; NaNO3; K2HPO4. A PCA plot showed a fairly good discrimination between ammonium nitrate and the remaining salts studied. In addition Fuzzy Art map analyses determined that the best classification was obtained using the Pt; Co; Cu and Ni electrodes. Moreover; PLS regression allowed the creation of a model to correlate the voltammetric response of the electrodes with concentrations of ammonium nitrate in the presence of potential interferents such as ammonium chloride and sodium nitrate.
Keywords: ammonium nitrate; electronic tongue; PCA; fuzzy ARTMAP; PLS ammonium nitrate; electronic tongue; PCA; fuzzy ARTMAP; PLS
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Campos, I.; Pascual, L.; Soto, J.; Gil-Sánchez, L.; Martínez-Máez, R. An Electronic Tongue Designed to Detect Ammonium Nitrate in Aqueous Solutions. Sensors 2013, 13, 14064-14078.

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