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Vol. 37 No. 12 (2025): Vol 37 Issue 12, 2025

Copyright (c) 2025 Mainao Juli Basumatary, Dr. Dipjyoti Kalita, Dr. Rajib Lochan Sarma, Dr. Jitumani Rajbongshi

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Ferrioxalate Complex Derived Electrochemical Sensor for Nitrate and Phosphate Ions Detection

https://doi.org/10.14233/ajchem.2025.34647
Mainao Juli Basumatary
Department of Chemistry, Bhattadev University, Pathsala, Bajali-781325, India
https://orcid.org/0009-0009-1264-6849
Dr. Dipjyoti Kalita
Department of Chemistry, Bhattadev University, Pathsala, Bajali-781325, India
https://orcid.org/0009-0000-6585-8954
Rajib Lochan Sarma
Department of Chemistry, Bhattadev University, Pathsala, Bajali-781325, India
https://orcid.org/0009-0007-5515-2561
Jitumani Rajbongshi
Department of Chemistry, Bhattadev University, Pathsala, Bajali-781325, India
https://orcid.org/0009-0006-0165-7057

Corresponding Author(s) : Jitumani Rajbongshi

che.jitumani@bhattadevuniversity.ac.in

Asian Journal of Chemistry, Vol. 37 No. 12 (2025): Vol 37 Issue 12, 2025

Abstract

Sensitive and selective sensing of nitrate and phosphate ions in aquatic environments is critical as their roles in eutrophication and potential hazards due to industrial and agricultural pollution. In this study, an electrochemical sensor using ferrioxalate, a complex routinely synthesized and discarded in undergraduate laboratories, is developed thus aligning with principles of green chemistry and waste valorisation. The metal-ligand coordination was confirmed by UV-Vis and FTIR spectroscopy showing characteristic stretching bands. The ferrioxalate complex was purified and used to modify a glassy carbon electrode. Electrochemical techniques, including cyclic voltammetry (CV) was employed to evaluate the complex’s sensitivity and selectivity toward nitrate and phosphate ions. The sensor exhibited a sensitivity of -5.16 × 10–6 A/µM for nitrate ions with a limit of detection (LOD) of approximately 0.70 µM. While voltammetric peaks were clearly defined even at concentrations below this LOD, these signals represent qualitative detection and do not meet the statistical criteria for reliable quantification due to inherent measurement noise. The phosphate ions sensor showed higher sensitivity and a correspondingly lower LOD of 0.45 µM. The developed sensor demonstrated good linearity and was successfully applied to real water samples, highlighting its accuracy and reliability. This method offers a sustainable, cost-effective platform for water quality monitoring, effectively using the material into a functional green sensor.

Keywords

Ferrioxalate complex Green chemistry Electrochemical sensor Nitrate ions Phosphate ions Cyclic voltammetry
(1)
Basumatary, M. J.; Kalita, D.; Sarma, R. L.; Rajbongshi, J. Ferrioxalate Complex Derived Electrochemical Sensor for Nitrate and Phosphate Ions Detection. ajc 2025, 37, 3019-3024.
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