Electrochemical behavior of fungicide tebuconazole and its voltammetric determination on an oxygen-terminated boron-doped diamond electrode

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 930; p. 117155
• Main Authors: Šelešovská, Renáta, Sokolová, Romana, Krejčová, Kateřina, Schwarzová-Pecková, Karolina, Mikysek, Tomáš, Matvieiev, Oleksandr
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2023
• Subjects: Boron-doped diamond electrode; IR spectroelectrochemistry; Oxidation; Tebuconazole; Triazole fungicide; Voltammetry; Voltammetry; Oxidation; Boron-doped diamond electrode; Tebuconazole; IR spectroelectrochemistry; Triazole fungicide
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2023.117155

[Display omitted] •The first report on direct electrooxidation of triazole fungicide tebuconazole.•Tebuconazole gives voltammetric signal at ca + 1.75 V on BDD electrode.•IR spectroelectrochemistry and density functional theory calculations performed.•Voltammetric method developed and pesticide interferences excluded.•Recoveries are 95 % − 106 % for river water and pesticide preparations analysis. The first study on electrochemical oxidation of triazole fungicide tebuconazole was performed using an oxygen-terminated boron-doped diamond electrode. The irreversible anodic process occurring at + 1.75 V (vs Ag/AgCl/KCl(sat.)) in 0.1 mol/L HNO3 was studied by cyclic voltammetry, IR spectroelectrochemistry, and density functional theory calculations. The oxidation of tebuconazole leads to the formation of the hydroxylated and dihydroxylated derivatives on the 4-chlorophenyl moiety. Also, the corresponding o-quinone derivative was detected. Further, the anodic signal was used to develop a differential pulse voltammetric method for tebuconazole determination with the following parameters: linear dynamic range from 5.0 × 10−7 to 8.3 × 10−5 mol/L and limit of detection of 1.5 × 10−7 mol/L. The method was successfully applied to the analysis of a commercially available pesticide formulation and model samples of river water after preconcentration of tebuconazole using Amberlite® IRC120 H ion-exchange resin in H+ cycle.