Highly Selective and Sensitive Voltammetric Determination of Cu(II) Based on the Formation of Cu(II)-Neocuproine Complex (CUPRAC) at Nafion-Coated Pencil Graphite Electrode
Journal of Analysis and Testing, 2026 (ESCI, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s41664-026-00499-7
- Dergi Adı: Journal of Analysis and Testing
- Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, Compendex, Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: Copper ion, Cu(II)-bisneocuproine complex, Nafion, Pencil graphite electrode, Voltammetric sensor
- Çanakkale Onsekiz Mart Üniversitesi Adresli: Evet
Özet
This research describes the application of a highly sensitive and selective differential pulse voltammetric method for the determination of Cu(II) in various environmental and food samples based on the oxidation/reduction of the Cu(II)-bisneocuproine complex ([Cu(NC)2]2+) at a Nafion-coated pencil graphite electrode (Nf@PGE). Differential pulse voltammetric measurements indicated that the proposed platform provided three linear ranges for both the oxidation (1.0–10.0, 10.0–100.0, and 102–104 nM) and reduction (1.0–10.0, 10.0–75.0, and 75.0–104 nM) of [Cu(NC)2]2+. Oxidation and reduction of the complex at the Nf@PGE yielded high sensitivity values of 1.28 and 4.60 µA/(µM·cm2), along with lower limit of detection (LOD) values of 0.33 and 0.59 nM, respectively. Interference studies also proved that the chelating ligand neocuproine (NC) displayed high selectivity for the determination of Cu(II) in the presence of various metal ions. The Cu(II) sensor was successfully applied to food and environmental samples, achieving acceptable and high recovery rates (89.3%–109.1%).