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Sensors 2019, 19(3), 669; https://doi.org/10.3390/s19030669

A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand

1
Grupo BIOeng, Escuela de Ingeniería Química, Universidad Técnica de Machala, Apartado 070151, Machala, Ecuador
2
Departamento de Química, Universidad Simón Bolívar, Apartado 89000, Caracas, Venezuela
3
Pontificia Universidad Católica del Ecuador, Escuela de Ciencias Químicas, Avenida 12 de octubre y Roca, Apartado 17-01-2184, Quito, Ecuador
4
Escuela Politécnica Nacional, Escuela de Formación de Tecnólogos, Apartado 17-01-2759, Quito, Ecuador
5
Institut de Tècniques Energètiques and Centre for Research in Nanoengineering, Universitat Politècnica de Catalunya, Barcelona 08034, Spain
*
Authors to whom correspondence should be addressed.
Received: 15 December 2018 / Revised: 24 January 2019 / Accepted: 31 January 2019 / Published: 6 February 2019
(This article belongs to the Section Chemical Sensors)
Full-Text   |   PDF [4182 KB, uploaded 12 February 2019]   |  

Abstract

We modified and evaluated the performance of a CuO/Cu electrochemical electrode for chemical oxygen demand (COD) determination by covering it with a Nafion (Nf) film. The resulting modified CuONf/Cu electrode sensor was used for the electrochemical determination of COD in river, slaughterhouse and estuarine water samples in order to evaluate its performance for this particular task. It was compared with the CuO/Cu sensor with no Nafion. The main electrochemical characteristics of interest, resistance, sensitivity, accuracy and reproducibility, were assessed by means of Linear Sweep Voltammetry using glucose as a standard. Results of these essays indicate that the procedure used produced smooth and firmly attached Nf films covering the whole copper surface. This sensor was shown to be resistant to interferences and effective in electro-oxidation of a wide range of organic compounds and therefore very useful for COD determination. Using the newly developed CuONf/Cu electrode an analytical linear range of 50 to 1000 mg·L−1 COD, with a detection limit of 2.11 mg·L−1 (n = 6) COD was achieved. The comparison shows that the CuONf/Cu sensor is more appropriate for COD determination than its counterpart with no Nafion. View Full-Text
Keywords: chemical oxygen demand; copper oxide electrode; nafion film; detection chemical oxygen demand; copper oxide electrode; nafion film; detection
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Carchi, T.; Lapo, B.; Alvarado, J.; Espinoza-Montero, P.J.; Llorca, J.; Fernández, L. A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand. Sensors 2019, 19, 669.

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