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Sensing of chemical oxygen demand (COD) by amperometric detection—dependence of current signal on concentration and type of organic species

The standard method to determine chemical oxygen demand (COD) with K(2)Cr(2)O(6) uses harmful chemicals, has a long analysis time, and cannot be used for on-site online monitoring. It is therefore necessary to find a fast, cheap, and harmless alternative. The amperometric determination of COD on bor...

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Autores principales: Lambertz, Samira, Franke, Marcus, Stelter, Michael, Braeutigam, Patrick
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer International Publishing 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10154276/
https://www.ncbi.nlm.nih.gov/pubmed/37129679
http://dx.doi.org/10.1007/s10661-023-11228-3
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author Lambertz, Samira
Franke, Marcus
Stelter, Michael
Braeutigam, Patrick
author_facet Lambertz, Samira
Franke, Marcus
Stelter, Michael
Braeutigam, Patrick
author_sort Lambertz, Samira
collection PubMed
description The standard method to determine chemical oxygen demand (COD) with K(2)Cr(2)O(6) uses harmful chemicals, has a long analysis time, and cannot be used for on-site online monitoring. It is therefore necessary to find a fast, cheap, and harmless alternative. The amperometric determination of COD on boron-doped diamond (BDD) electrodes is a promising approach. However, to be a suitable alternative, the electrochemical method must at least be able to determine the COD of water samples independently of the contained substances. Therefore, the current signal as a function of various organic materials was investigated for the first time. It was shown that the height of the signal current depended on the type of organic matter in single-substance solutions and that this substance dependency increases with the amount of COD. Those findings could be explained by the mechanism proposed for this reaction, showing that the selectivity of the reaction depends on the ratio of the concentration of hydroxyl radicals and organic species. We give an outlook on how to improve the method in order to increase the linear working range and avoid signal variance and how to further explain the signal variance. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10661-023-11228-3.
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spelling pubmed-101542762023-05-04 Sensing of chemical oxygen demand (COD) by amperometric detection—dependence of current signal on concentration and type of organic species Lambertz, Samira Franke, Marcus Stelter, Michael Braeutigam, Patrick Environ Monit Assess Research The standard method to determine chemical oxygen demand (COD) with K(2)Cr(2)O(6) uses harmful chemicals, has a long analysis time, and cannot be used for on-site online monitoring. It is therefore necessary to find a fast, cheap, and harmless alternative. The amperometric determination of COD on boron-doped diamond (BDD) electrodes is a promising approach. However, to be a suitable alternative, the electrochemical method must at least be able to determine the COD of water samples independently of the contained substances. Therefore, the current signal as a function of various organic materials was investigated for the first time. It was shown that the height of the signal current depended on the type of organic matter in single-substance solutions and that this substance dependency increases with the amount of COD. Those findings could be explained by the mechanism proposed for this reaction, showing that the selectivity of the reaction depends on the ratio of the concentration of hydroxyl radicals and organic species. We give an outlook on how to improve the method in order to increase the linear working range and avoid signal variance and how to further explain the signal variance. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10661-023-11228-3. Springer International Publishing 2023-05-02 2023 /pmc/articles/PMC10154276/ /pubmed/37129679 http://dx.doi.org/10.1007/s10661-023-11228-3 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Research
Lambertz, Samira
Franke, Marcus
Stelter, Michael
Braeutigam, Patrick
Sensing of chemical oxygen demand (COD) by amperometric detection—dependence of current signal on concentration and type of organic species
title Sensing of chemical oxygen demand (COD) by amperometric detection—dependence of current signal on concentration and type of organic species
title_full Sensing of chemical oxygen demand (COD) by amperometric detection—dependence of current signal on concentration and type of organic species
title_fullStr Sensing of chemical oxygen demand (COD) by amperometric detection—dependence of current signal on concentration and type of organic species
title_full_unstemmed Sensing of chemical oxygen demand (COD) by amperometric detection—dependence of current signal on concentration and type of organic species
title_short Sensing of chemical oxygen demand (COD) by amperometric detection—dependence of current signal on concentration and type of organic species
title_sort sensing of chemical oxygen demand (cod) by amperometric detection—dependence of current signal on concentration and type of organic species
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10154276/
https://www.ncbi.nlm.nih.gov/pubmed/37129679
http://dx.doi.org/10.1007/s10661-023-11228-3
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