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All Journal Hydrogen: Jurnal Kependidikan Kimia
Okta Suryani
Chemistry Department, Faculty of Science and Education, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Barat, Padang, Indonesia
Chemistry Education

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NiAl₂O₄ -Modified Glassy Carbon Electrode From Napa Soil For Pb²⁺ Ions Using Voltammetry Zsa Zsa Fitria Alizar; Mawardi Mawardi; Alizar Ulianas; Syamsi Aini; Okta Suryani
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 3 (2026): June 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i3.21254

Abstract

Lead (Pb²⁺) is a toxic heavy metal that poses serious risks to environmental and human health, creating a need for sensitive and reliable detection methods. This study aimed to develop a glassy carbon electrode (GCE) modified with NiAl₂O₄ derived from Napa soil for the electrochemical detection of Pb²⁺ ions using voltammetric techniques. The electrochemical performance of the modified electrode was evaluated by cyclic voltammetry in 4 mM K₃[Fe(CN)₆] containing 0,1 M KCl. The results showed that the NiAl₂O₄-modified GCE exhibited enhanced electrochemical activity compared with the bare GCE, as indicated by an increase in anodic peak current from 19.93 μA to 26.60 μA (33.5%) and cathodic peak current from 19.03 μA to 24.29 μA (27.6%), reflecting improved electron-transfer capability and a larger electroactive surface area. The modified electrode successfully detected Pb²⁺ ions, producing well-defined oxidation and reduction peaks at −0.32 V and −0.52 V, respectively. Among the supporting electrolytes investigated, 0,1 M KCl provided the highest current response, and increasing the KCl concentration from 0.05 M to 0,10 M further enhanced the electrochemical signal. In addition, the electrode demonstrated good stability during repeated measurements. These findings indicate that the NiAl₂O₄-modified GCE based on Napa soil is a promising, low-cost, and sensitive electrochemical sensor for Pb²⁺ detection with improved electrochemical performance.
Co-Authors Alizar Ulianas Mawardi Mawardi Syamsi Aini Zsa Zsa Fitria Alizar