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

Abstract

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). 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. The 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. Accuracy and repeatability of the proposed method was 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, new voltammetric method using m-MCCM_Template_Vers 4