Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes

Ollé Rodrigue Kam; Abdoulkadri Ayouba Mahamane; Corneille Bakouan; Boubié Guel

doi:doi:10.11648/j.sjac.20261401.11

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Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes

Ollé Rodrigue Kam^*

, Abdoulkadri Ayouba Mahamane, Corneille Bakouan

, Boubié Guel

Published in Science Journal of Analytical Chemistry (Volume 14, Issue 1)

Received: 7 December 2025 Accepted: 12 January 2026 Published: 15 January 2026

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Abstract

This study focuses on evaluating the electrochemical behavior of the ferri/ferrocyanide redox couple [Fe(CN)₆^3-/Fe(CN)₆^4-] on EDTA-modified carbon paste electrodes, with the aim of developing a sensitive electrochemical sensor for the detection of trivalent and hexavalent chromium Cr(III,VI). EDTA, a complexing agent well known for its strong affinity for metal ions, was incorporated at a concentration of 10% in the carbon paste to enhance the electrode's ion recognition properties. Electrochemical characterization was performed by cyclic voltammetry in the presence of the ferri/ferrocyanide redox couple, used as a probe to assess electron transfer properties. Electrochemical parameters, including the peak potential difference (ΔEp), the anodic and cathodic peak currents (Ipa, Ipc), and their ratio, demonstrated the improved redox behavior and sensitivity of the modified electrode. The observed improvement is likely due to the complexing functional groups of EDTA, which facilitate stronger interactions between the modified electrode surface and the redox species in solution. Electrochemical impedance spectroscopy supports the voltammetric findings, confirming enhanced charge transfer kinetics at the surface of the modified electrode. The results confirm the potential of this configuration as an effective platform for developing reliable and selective electrochemical sensors for detecting Cr(III,VI) in aqueous media. By studying the electrical quantities ΔEp, the formal standard potential E°, and the Ipa/Ipc current ratio, the developed electrochemical sensors can be optimized.

Published in	Science Journal of Analytical Chemistry (Volume 14, Issue 1)
DOI	10.11648/j.sjac.20261401.11
Page(s)	1-9
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2026. Published by Science Publishing Group

Keywords

EDTA, Electrochemical, Ferri/Ferrocyanide, Voltammetry, Carbon Paste Electrode

References

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APA Style

Kam, O. R., Mahamane, A. A., Bakouan, C., Guel, B. (2026). Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes. Science Journal of Analytical Chemistry, 14(1), 1-9. https://doi.org/10.11648/j.sjac.20261401.11

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ACS Style

Kam, O. R.; Mahamane, A. A.; Bakouan, C.; Guel, B. Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes. Sci. J. Anal. Chem. 2026, 14(1), 1-9. doi: 10.11648/j.sjac.20261401.11

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AMA Style

Kam OR, Mahamane AA, Bakouan C, Guel B. Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes. Sci J Anal Chem. 2026;14(1):1-9. doi: 10.11648/j.sjac.20261401.11

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@article{10.11648/j.sjac.20261401.11,
  author = {Ollé Rodrigue Kam and Abdoulkadri Ayouba Mahamane and Corneille Bakouan and Boubié Guel},
  title = {Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes},
  journal = {Science Journal of Analytical Chemistry},
  volume = {14},
  number = {1},
  pages = {1-9},
  doi = {10.11648/j.sjac.20261401.11},
  url = {https://doi.org/10.11648/j.sjac.20261401.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sjac.20261401.11},
  abstract = {This study focuses on evaluating the electrochemical behavior of the ferri/ferrocyanide redox couple [Fe(CN)₆3-/Fe(CN)₆4-] on EDTA-modified carbon paste electrodes, with the aim of developing a sensitive electrochemical sensor for the detection of trivalent and hexavalent chromium Cr(III,VI). EDTA, a complexing agent well known for its strong affinity for metal ions, was incorporated at a concentration of 10% in the carbon paste to enhance the electrode's ion recognition properties. Electrochemical characterization was performed by cyclic voltammetry in the presence of the ferri/ferrocyanide redox couple, used as a probe to assess electron transfer properties. Electrochemical parameters, including the peak potential difference (ΔEp), the anodic and cathodic peak currents (Ipa, Ipc), and their ratio, demonstrated the improved redox behavior and sensitivity of the modified electrode. The observed improvement is likely due to the complexing functional groups of EDTA, which facilitate stronger interactions between the modified electrode surface and the redox species in solution. Electrochemical impedance spectroscopy supports the voltammetric findings, confirming enhanced charge transfer kinetics at the surface of the modified electrode. The results confirm the potential of this configuration as an effective platform for developing reliable and selective electrochemical sensors for detecting Cr(III,VI) in aqueous media. By studying the electrical quantities ΔEp, the formal standard potential E°, and the Ipa/Ipc current ratio, the developed electrochemical sensors can be optimized.},
 year = {2026}
}

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TY  - JOUR
T1  - Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes
AU  - Ollé Rodrigue Kam
AU  - Abdoulkadri Ayouba Mahamane
AU  - Corneille Bakouan
AU  - Boubié Guel
Y1  - 2026/01/15
PY  - 2026
N1  - https://doi.org/10.11648/j.sjac.20261401.11
DO  - 10.11648/j.sjac.20261401.11
T2  - Science Journal of Analytical Chemistry
JF  - Science Journal of Analytical Chemistry
JO  - Science Journal of Analytical Chemistry
SP  - 1
EP  - 9
PB  - Science Publishing Group
SN  - 2376-8053
UR  - https://doi.org/10.11648/j.sjac.20261401.11
AB  - This study focuses on evaluating the electrochemical behavior of the ferri/ferrocyanide redox couple [Fe(CN)₆3-/Fe(CN)₆4-] on EDTA-modified carbon paste electrodes, with the aim of developing a sensitive electrochemical sensor for the detection of trivalent and hexavalent chromium Cr(III,VI). EDTA, a complexing agent well known for its strong affinity for metal ions, was incorporated at a concentration of 10% in the carbon paste to enhance the electrode's ion recognition properties. Electrochemical characterization was performed by cyclic voltammetry in the presence of the ferri/ferrocyanide redox couple, used as a probe to assess electron transfer properties. Electrochemical parameters, including the peak potential difference (ΔEp), the anodic and cathodic peak currents (Ipa, Ipc), and their ratio, demonstrated the improved redox behavior and sensitivity of the modified electrode. The observed improvement is likely due to the complexing functional groups of EDTA, which facilitate stronger interactions between the modified electrode surface and the redox species in solution. Electrochemical impedance spectroscopy supports the voltammetric findings, confirming enhanced charge transfer kinetics at the surface of the modified electrode. The results confirm the potential of this configuration as an effective platform for developing reliable and selective electrochemical sensors for detecting Cr(III,VI) in aqueous media. By studying the electrical quantities ΔEp, the formal standard potential E°, and the Ipa/Ipc current ratio, the developed electrochemical sensors can be optimized.
VL  - 14
IS  - 1
ER  -

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Author Information

Ollé Rodrigue Kam

Department of Physics and Chemistry, Banfora University Center, Banfora, Burkina Faso

Contact Email

http://orcid.org/0009-0003-9135-8322
Abdoulkadri Ayouba Mahamane

Chemistry Department, Abdou Moumouni University, Niamey, Niger

Contact Email
Corneille Bakouan

Department of Physics and Chemistry, Lédéa Bernard Ouedraogo University, Ouahigouya, Burkina Faso

Contact Email

http://orcid.org/0000-0003-4890-532X
Boubié Guel

Chemistry Department, Joseph KI-ZERBO University, Ouagadougou, Burkina Faso

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APA Style

Kam, O. R., Mahamane, A. A., Bakouan, C., Guel, B. (2026). Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes. Science Journal of Analytical Chemistry, 14(1), 1-9. https://doi.org/10.11648/j.sjac.20261401.11

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ACS Style

Kam, O. R.; Mahamane, A. A.; Bakouan, C.; Guel, B. Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes. Sci. J. Anal. Chem. 2026, 14(1), 1-9. doi: 10.11648/j.sjac.20261401.11

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AMA Style

Kam OR, Mahamane AA, Bakouan C, Guel B. Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes. Sci J Anal Chem. 2026;14(1):1-9. doi: 10.11648/j.sjac.20261401.11

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@article{10.11648/j.sjac.20261401.11,
  author = {Ollé Rodrigue Kam and Abdoulkadri Ayouba Mahamane and Corneille Bakouan and Boubié Guel},
  title = {Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes},
  journal = {Science Journal of Analytical Chemistry},
  volume = {14},
  number = {1},
  pages = {1-9},
  doi = {10.11648/j.sjac.20261401.11},
  url = {https://doi.org/10.11648/j.sjac.20261401.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sjac.20261401.11},
  abstract = {This study focuses on evaluating the electrochemical behavior of the ferri/ferrocyanide redox couple [Fe(CN)₆3-/Fe(CN)₆4-] on EDTA-modified carbon paste electrodes, with the aim of developing a sensitive electrochemical sensor for the detection of trivalent and hexavalent chromium Cr(III,VI). EDTA, a complexing agent well known for its strong affinity for metal ions, was incorporated at a concentration of 10% in the carbon paste to enhance the electrode's ion recognition properties. Electrochemical characterization was performed by cyclic voltammetry in the presence of the ferri/ferrocyanide redox couple, used as a probe to assess electron transfer properties. Electrochemical parameters, including the peak potential difference (ΔEp), the anodic and cathodic peak currents (Ipa, Ipc), and their ratio, demonstrated the improved redox behavior and sensitivity of the modified electrode. The observed improvement is likely due to the complexing functional groups of EDTA, which facilitate stronger interactions between the modified electrode surface and the redox species in solution. Electrochemical impedance spectroscopy supports the voltammetric findings, confirming enhanced charge transfer kinetics at the surface of the modified electrode. The results confirm the potential of this configuration as an effective platform for developing reliable and selective electrochemical sensors for detecting Cr(III,VI) in aqueous media. By studying the electrical quantities ΔEp, the formal standard potential E°, and the Ipa/Ipc current ratio, the developed electrochemical sensors can be optimized.},
 year = {2026}
}

Copy | Download

TY  - JOUR
T1  - Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes
AU  - Ollé Rodrigue Kam
AU  - Abdoulkadri Ayouba Mahamane
AU  - Corneille Bakouan
AU  - Boubié Guel
Y1  - 2026/01/15
PY  - 2026
N1  - https://doi.org/10.11648/j.sjac.20261401.11
DO  - 10.11648/j.sjac.20261401.11
T2  - Science Journal of Analytical Chemistry
JF  - Science Journal of Analytical Chemistry
JO  - Science Journal of Analytical Chemistry
SP  - 1
EP  - 9
PB  - Science Publishing Group
SN  - 2376-8053
UR  - https://doi.org/10.11648/j.sjac.20261401.11
AB  - This study focuses on evaluating the electrochemical behavior of the ferri/ferrocyanide redox couple [Fe(CN)₆3-/Fe(CN)₆4-] on EDTA-modified carbon paste electrodes, with the aim of developing a sensitive electrochemical sensor for the detection of trivalent and hexavalent chromium Cr(III,VI). EDTA, a complexing agent well known for its strong affinity for metal ions, was incorporated at a concentration of 10% in the carbon paste to enhance the electrode's ion recognition properties. Electrochemical characterization was performed by cyclic voltammetry in the presence of the ferri/ferrocyanide redox couple, used as a probe to assess electron transfer properties. Electrochemical parameters, including the peak potential difference (ΔEp), the anodic and cathodic peak currents (Ipa, Ipc), and their ratio, demonstrated the improved redox behavior and sensitivity of the modified electrode. The observed improvement is likely due to the complexing functional groups of EDTA, which facilitate stronger interactions between the modified electrode surface and the redox species in solution. Electrochemical impedance spectroscopy supports the voltammetric findings, confirming enhanced charge transfer kinetics at the surface of the modified electrode. The results confirm the potential of this configuration as an effective platform for developing reliable and selective electrochemical sensors for detecting Cr(III,VI) in aqueous media. By studying the electrical quantities ΔEp, the formal standard potential E°, and the Ipa/Ipc current ratio, the developed electrochemical sensors can be optimized.
VL  - 14
IS  - 1
ER  -

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