@misc{10481/87256,
year = {2011},
url = {https://hdl.handle.net/10481/87256},
abstract = {A disposable optical tongue for the alkaline ions Na(I) and K(I) is described. The two-sensor layout prepared on a transparent support consists of non-specific polymeric membranes working by ionophore-chromoionophore chemistry. The non-specific behavior of the membranes was controlled by means of the crown ether-type ionophore present. The imaging of the tongue, after reaction for 3 min with the unknown solution, by means of a conventional flatbed scanner working by transmission mode, makes it possible to calculate the H (hue) value of the hue, saturation, value (HSV) color space used as a robust and precise analytical parameter. The modelling of the response of the two-sensor tongue as a sigmoidal surface is used to characterize the behavior of the tongue and as a basis to infer the concentration values. To compute the concentration of two analytes from the two hue values obtained using the optical tongue, a surface fit approach was used. The tongue works over a wide dynamic range (1.0×10(-4)-0.1 M both in Na(I) and K(I)). The sensing membranes show good intramembrane (1.4% RSD) and intermembrane precision (0.71% RSD) and lifetime (around 45 days in darkness). The procedure was used to analyze Na(I) and K(I) in different types of natural waters (tap and mineral), validating the results against a reference procedure.},
organization = {We acknowledge financial support from the Ministerio de Educación y Ciencia, Dirección General de Enseñanza Superior (Spain) (Projects CTQ2005-09060-CO2-01, CTQ2005-09060-CO2-02 and 
CTQ2009-14428-C02-01).},
publisher = {Elsevier},
title = {A surface fit approach with a disposable optical tongue for alkaline ion analysis},
doi = {10.1016/j.aca.2011.03.043},
author = {Erenas Rodríguez, Miguel María and Piñeiro, Óscar and Pegalajar Cuéllar, Manuel and Orbe Payá, Ignacio De and Capitán Vallvey, Luis Fermín and Pegalajar Jiménez, María Del Carmen},
}