Interferent-free electrochemical detection of nitrate in water using copper–cobalt-based sensor
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Accepted Version
Authors' original accepted manuscript
Date
2025-07-24
Authors
Das, Daisy
O'Riordan, Alan
Shao, Han
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
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Abstract
Nitrate contamination in water is a significant global concern, prompting regulatory bodies such as the European Union to set a maximum permissible limit of 44 mg/L in drinking water. However, conventional laboratory-based detection methods are time-consuming and require specialized expertise, while chemical electrode systems often suffer from drawbacks such as frequent recalibration and ion cross sensitivity, limiting their suitability for long-term and on-site monitoring. In response to these challenges, we present a novel and cost-effective electrochemical sensor based on a copper–cobalt-based electrochemical sensor for reliable nitrate detection. The sensor exhibits a remarkable true detection limit of 0.19 µM and a limit of quantification of 4.41 µM and demonstrates high selectivity even in the presence of commonly interfering ions such as Mg2+, SO42-, Zn2+, K+, NH4+, Fe2+, and Na+. Owing to its sensitivity, selectivity, and portability, the developed sensor offers a promising solution for real-time, on-site monitoring of nitrate concentrations in both water and soil samples.
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Keywords
Chemical and biological sensors , Nanomaterial , Nitrate detection , Real-time monitoring , Water contamination
Citation
Das, D., O'Riordan, A. and Shao, H. (2025) Interferent-free electrochemical detection of nitrate in water using copper–cobalt-based sensor', IEEE Sensors Letters, 9(9), 4501804, pp. 1-4. https://doi.org/10.1109/LSENS.2025.3592316
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