Voltammetric Detection of Zn2+ Ions Using a Glassy Carbon Electrode Modified with Napa-Soil-Derived NiAl2O4

Authors

  • Dhea Septiani Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia
  • Mawardi Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia
  • Indang Dewata Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia
  • Umar Kalmar Nizar Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia
  • Okta Suryani Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang,Jl.Prof. Dr.Hamka Air Tawar Barat, Padang, Indonesia

DOI:

https://doi.org/10.33394/hjkk.v14i2.20367

Keywords:

Zn2+ Detection, Cyclic Voltammetry, Glassy Carbon Electrode, Napa Soil; NiAl2O4, Electrochemical Sensor

Abstract

This study reports the development of a glassy carbon electrode (GCE) modified with NiAl2O4 derived from napa soil for the voltammetric detection of Zn2+ ions. The modified electrode was prepared using a drop-casting method and characterized in 4.0 mM K3[Fe(CN)6] with 0.1 M KCl as the supporting electrolyte. The results showed an increase in oxidation peak current from 19.93 µA (bare GCE) to 26.80 µA and reduction peak current from −19.03 µA to −24.29 µA after modification, indicating enhanced electron transfer. Zn2+ detection was carried out in the concentration range of 1–3 mM, where the reduction peak current increased from −85.49 µA to −170.83 µA with increasing concentration. A linear relationship between concentration and current response was obtained with a regression equation of y = -42.67x – 40.42 and a correlation coefficient (R2 = 0.9907), indicating good linearity of the sensor. The limit of detection (LOD) was calculated to be 0.21 mM. Among the tested supporting electrolytes, 0.1 M KCl provided the highest and most stable current response. Although the modified electrode shows improved performance, the detection range is still limited to the millimolar level, and further studies are required to evaluate selectivity, reproducibility, and applicability in real samples. These findings demonstrate the potential of napa-soil-derived NiAl2O4 as a sustainable and cost-effective material for electrochemical sensing applications.

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Published

2026-05-05

How to Cite

Septiani, D., Mawardi, Dewata, I., Nizar, U. K., & Suryani, O. (2026). Voltammetric Detection of Zn2+ Ions Using a Glassy Carbon Electrode Modified with Napa-Soil-Derived NiAl2O4. Hydrogen: Jurnal Kependidikan Kimia, 14(2). https://doi.org/10.33394/hjkk.v14i2.20367

Issue

Vol. 14 No. 2 (2026): April 2026

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Articles

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Copyright (c) 2026 Dhea Septiani, Mawardi, Umar Kalmar Nizar, Okta Suryani

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