Reduction behavior of insecticide azoxystrobin and its voltammetric determination using silver solid amalgam electrode

• Published in: Monatshefte für Chemie Vol. 150; no. 3; pp. 419 - 428
• Main Authors: Šelešovská, Renáta, Herynková, Marie, Skopalová, Jana, Kelíšková-Martinková, Pavlína, Janíková, Lenka, Chýlková, Jaromíra
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 04.03.2019; Springer Nature B.V
• Subjects: Analytical Chemistry; Chemical reduction; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Electrodes; Fungicides; High-performance liquid chromatography; Inorganic Chemistry; Mass spectrometry; Mercury (metal); Organic Chemistry; Original Paper; Pesticides; Physical Chemistry; Theoretical and Computational Chemistry; Voltammetry; Reduction mechanism; Azoxystrobin; Voltammetric determination; Silver solid amalgam electrode; Pesticides
• ISSN: 0026-9247; 1434-4475
• DOI: 10.1007/s00706-018-2348-y

Electrochemical reduction of systemic fungicide azoxystrobin, used to protect a wide variety of crops, was investigated using cyclic voltammetry with a mercury meniscus-modified silver solid amalgam electrode (m-AgSAE). The mechanism of the electrochemical reduction was proposed and supported with high-performance liquid chromatography/mass spectrometry analysis of azoxystrobin solutions electrolyzed on mercury pool electrode. An analytical method for the determination of azoxystrobin by differential pulse voltammetry with m-AgSAE was developed. A wide linear dynamic range (2.0 × 10 −6 –5.0 × 10 −5  mol dm −3 ) and low limit of detection (7 × 10 −7  mol dm −3 ) were obtained. The accuracy and repeatability of the proposed method were evaluated by the analysis of model solutions with recovery from 96.0 to 104.0% and relative standard deviation of 5 repeated determinations < 3.5%. Finally, a new voltammetric method using m-AgSAE was successfully applied for azoxystrobin determination in real samples, concretely in spiked river water and pesticide preparations. Graphical abstract