Publication detail

Oxidation Behavior of Insecticide Azoxystrobin and its Voltammetric Determination Using Boron-doped Diamond Electrode

Year: 2019

Type of publication: článek v odborném periodiku

Name of source: Electroanalysis

Publisher name: Wiley-VCH

Place: Weinheim

Page from-to: 363-373

Titles:

Language	Name	Abstract	Keywords
cze	Oxidační chování insekticidu azoxystrobinu a jeho voltametrické stanovení s využitím elektrody z borem dopovaného diamantu	Elektrochemická oxidace azoxystrobinu byla studována pomocí cyklické voltametrie na elektrodě z borem dopovaného diamantu (BDDE). Byly pozorovány dva oxidační signály v širokém rozsahu pH elektrolytu. Byl navržen mechanismus oxidace, který byl potvrzen analýzou elektrolyzovaných roztoků azoxystrobinu s využitím kapalinové chromatografie s hmotnostní detekcí. Jako hlavní produkt dvouelektronové oxidace byl identifikován methyl 2-(2-{[6-(2-cyanophenoxy)pyrimidin-4-yl]oxy}phenyl)-2-hydroxy-3-oxopropanoat. voltametrická metoda pro stanovení azoxystrobinu byla vyvinuta a úspěšně aplikována při analýze modelových roztoků i reálných vzorků pesticidních přípravků.	Pesticidy; Azoxystrobin; Oxidační mechanismus; Voltametrické stanovení; elektroda z borem dopovaného diamantu
eng	Oxidation Behavior of Insecticide Azoxystrobin and its Voltammetric Determination Using Boron-doped Diamond Electrode	Electrochemical oxidation of azoxystrobin, a systemic fungicide commonly used in agriculture to protect a wide variety of crops, was investigated using cyclic voltammetry with a boron-doped diamond electrode (BDDE) in aqueous buffer solutions. Two pH independent irreversible anodic current peaks controlled mostly by diffusion were observed in wide pH range (2 to 12) at potentials +1600mV and +2150mV vs. saturated silver-silver chloride electrode. Mechanism of the electrochemical oxidation was proposed and supported with high performance liquid chromatography/mass spectrometry analysis of azoxystrobin solutions electrolyzed on carbon fiber brush electrode. The main product of the first two-electron oxidation step was identified as methyl 2-(2-{[6-(2-cyanophenoxy)pyrimidin-4-yl]oxy}phenyl)-2-hydroxy-3-oxopropanoate. An analytical method for the determination of azoxystrobin in water samples and pesticide preparation by differential pulse voltammetry with BDDE was developed. The method provides a wide linear dynamic range (3.0x10(-7) to 2.0x10(-4)molL(-1)) with limit of detection 8x10(-8)molL(-1). Accuracy of the method was evaluated by the addition and recovery method with recoveries ranging from 96.0 to 105.8%. Interference study proved sufficient selectivity of the developed voltammetric method for the azoxystrobin determination in presence of azole fungicides as well as pesticides used to prevent the same crops.	Pesticides; Azoxystrobine; Oxidation mechanism; Voltammetric determination; Boron-doped diamond electrode

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