Research Article
Electrochemical Investigation of the Ferri/Ferrocyanide Redox Couple on EDTA-Carbon Paste Electrodes
Ollé Rodrigue Kam*
,
Abdoulkadri Ayouba Mahamane,
Corneille Bakouan,
Boubié Guel
Issue:
Volume 14, Issue 1, March 2026
Pages:
1-9
Received:
7 December 2025
Accepted:
12 January 2026
Published:
15 January 2026
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.
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 affin...
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Research Article
Assessing Selected Nutrient Content and Quality of Conventional Composts for Crop Production in Western Oromia, Ethiopia
Issue:
Volume 14, Issue 1, March 2026
Pages:
10-17
Received:
16 December 2025
Accepted:
31 December 2025
Published:
26 January 2026
DOI:
10.11648/j.sjac.20261401.12
Downloads:
Views:
Abstract: One of the main reasons for poor soil fertility status of acidic soils is low content of soil available plant nutrients like N, P, S, exchangeable Ca and Mg and toxicity of Al and Fe resulted from low soil pH value. Amendment of acidic soil using organic sources like compost is very crucial for improving the livelihood of the society through increasing crop productivity. Therefore, this study was conducted to assess the nutrient content and quality of compost prepared at farmers‘ level and guiding the integrated use of both chemical and organic fertilizers approach sustainably. The compost samples were collected from seven districts, namely Guto-Gida, Sassiga, Guduru, Horo, Jima-Genet, Hawa-Gelan and Nedjo, in western Oromia Regional State. The composts were prepared at farmers’ level from the locally available composting materials. The composting materials used were more or less similar in all districts except it might vary in one or two sources which were used at very low ratio compared to the main sources. The result of the compost nutrient content revealed that the mean values of EC, pH, TN and C:N ratio ranged from 1.22 to 1.99 mmhos/cm, 7.25 to 8.20, 0.45 to 0.74% and 11.51 to 12.65, respectively which fell within the acceptable range for good quality compost. On the other hand, the mean values of OC, available P, exchangeable Ca and Mg were ranged from 5.19 to 7.83%, 0.006 to 0.013%, 44.79 to 83.72 mg kg soil–1 and 1.40 to 8.61 mg kg compost–1, respectively which fell below the acceptable range for good quality compost. Based on the crucial parameters indicating good quality compost like pH and C:N ratio the compost prepared from the locally available composting materials by the farmers were for improving the overall quality of the soil. Hence, productivity of crops would increased by using compost as source of organic fertilizers from which farmers in the study area benefited sustainably.
Abstract: One of the main reasons for poor soil fertility status of acidic soils is low content of soil available plant nutrients like N, P, S, exchangeable Ca and Mg and toxicity of Al and Fe resulted from low soil pH value. Amendment of acidic soil using organic sources like compost is very crucial for improving the livelihood of the society through increa...
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