A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand
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 e...
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MDPI AG
2019-02-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/19/3/669 |
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| author | Tanya Carchi Byron Lapo José Alvarado Patricio J. Espinoza-Montero Jordi Llorca Lenys Fernández |
| author_facet | Tanya Carchi Byron Lapo José Alvarado Patricio J. Espinoza-Montero Jordi Llorca Lenys Fernández |
| author_sort | Tanya Carchi |
| collection | DOAJ |
| description | 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<sup>−1</sup> COD, with a detection limit of 2.11 mg·L<sup>−1</sup> (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. |
| first_indexed | 2024-04-11T21:46:40Z |
| format | Article |
| id | doaj.art-5dc6696010d64dc59178104b78557620 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T21:46:40Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-5dc6696010d64dc59178104b785576202022-12-22T04:01:24ZengMDPI AGSensors1424-82202019-02-0119366910.3390/s19030669s19030669A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen DemandTanya Carchi0Byron Lapo1José Alvarado2Patricio J. Espinoza-Montero3Jordi Llorca4Lenys Fernández5Grupo BIOeng, Escuela de Ingeniería Química, Universidad Técnica de Machala, Apartado 070151, Machala, EcuadorGrupo BIOeng, Escuela de Ingeniería Química, Universidad Técnica de Machala, Apartado 070151, Machala, EcuadorDepartamento de Química, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaPontificia Universidad Católica del Ecuador, Escuela de Ciencias Químicas, Avenida 12 de octubre y Roca, Apartado 17-01-2184, Quito, EcuadorInstitut de Tècniques Energètiques and Centre for Research in Nanoengineering, Universitat Politècnica de Catalunya, Barcelona 08034, SpainDepartamento de Química, Universidad Simón Bolívar, Apartado 89000, Caracas, VenezuelaWe 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<sup>−1</sup> COD, with a detection limit of 2.11 mg·L<sup>−1</sup> (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.https://www.mdpi.com/1424-8220/19/3/669chemical oxygen demandcopper oxide electrodenafion filmdetection |
| spellingShingle | Tanya Carchi Byron Lapo José Alvarado Patricio J. Espinoza-Montero Jordi Llorca Lenys Fernández A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand Sensors chemical oxygen demand copper oxide electrode nafion film detection |
| title | A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand |
| title_full | A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand |
| title_fullStr | A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand |
| title_full_unstemmed | A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand |
| title_short | A Nafion Film Cover to Enhance the Analytical Performance of the CuO/Cu Electrochemical Sensor for Determination of Chemical Oxygen Demand |
| title_sort | nafion film cover to enhance the analytical performance of the cuo cu electrochemical sensor for determination of chemical oxygen demand |
| topic | chemical oxygen demand copper oxide electrode nafion film detection |
| url | https://www.mdpi.com/1424-8220/19/3/669 |
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