Septiani, D. et al. 2026. Voltammetric Detection of Zn2+ Ions Using a Glassy Carbon Electrode Modified with Napa-Soil-Derived NiAl2O4. Hydrogen: Jurnal Kependidikan Kimia. 14, 2 (May 2026). DOI:https://doi.org/10.33394/hjkk.v14i2.20367.