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Sensors 2006, 6(5), 480-491; doi:10.3390/s6050480
Article

An Ion-selective Electrode for Anion Perchlorate in Thick-film Technology

1, 1, 1, 1, 1,* , 2,*  and 2
1 Instituto de Investigación en Química Molecular Aplicada, Departamento de Quimica, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022-Valencia, Spain 2 Instituto de Investigación en Química Molecular Aplicada, Departamento de Ingeniería Electrónica, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022-Valencia, Spain
* Authors to whom correspondence should be addressed.
Received: 23 January 2006 / Accepted: 26 March 2006 / Published: 7 April 2006
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Abstract

The ionophore 1,4,7,10,13-penta(n-octyl)-1,4,7,10,13-pentaazacyclopentadecane(L1) was used for the development of miniaturised perchlorate-selective electrodes in thick-film technology. Different PVC membranes containing L1 and the plasticizers o-nitrophenyloctyl ether (NPOE), dibutyl phthalate (DBP), bis(2-ethylhexyl)sebacate (DOS) and dibutylsebacate (DBS) were prepared and placed on a graphite working electrode manufactured byusing thick film serigraphic technology. The perchlorate selective electrode containing DBSas plasticizer showed a potentiometric Nernstian response of -57 mV per decade in a rangeof perchlorate concentration from 1 x 10-4 to 1 x 10-1 M with a detection limit of 5 x 10-5 M.The ion selective electrodes containing DBP and NPOE as plasticizers exhibit a workingrange from 6.3 x 10-5 to 1 x 10-1 M and 7.4 x 10-5 to 1 x 10-1 M for perchlorate, respectively,with a detection limit of ca. 2.2 x 10-5 M. For all three electrodes a response time of ca. 5 s was found. The prepared electrodes do not show appreciable decay of the slope for at least 25 days. Potentiometric selectivity coefficients (log KpotClO4-,X-) with respect to the primaryanion perchlorate were evaluated using the fixed interference method. These coefficients areof the order of 10-1.7 or smaller, indicating the relatively poor interference of the differentanions studied.
Keywords: ion-selective electrodes; perchlorate; thick-film. ion-selective electrodes; perchlorate; thick-film.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Segui, M.J.; Lizondo-Sabater, J.; Martínez-Máñez, R.; Sancenón, F.; Soto, J.; García-Breijo, E.; Gil, L. An Ion-selective Electrode for Anion Perchlorate in Thick-film Technology. Sensors 2006, 6, 480-491.

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