Reduction behavior of insecticide azoxystrobin and its voltammetric determination using silver solid amalgam electrode
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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.
KeywordsPesticides Azoxystrobin Reduction mechanism Voltammetric determination Silver solid amalgam electrode
This work was supported by the grant project of The Czech Science Foundation (Project No. 17-03868S) by The University of Pardubice (Projects No. SGSFChT_2018_003 and SD373001/82/30350(2016)) and by Palacký University in Olomouc (Project IGA_PrF_2018_027).
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