Abstract
An electrochemical procedure for the quantitative determination of oxycarboxin at a glassy carbon electrode (GCE) and a glassy carbon electrode modified with multi-walled carbon nanotubes (GCE/MWCNTs) based on square wave adsorptive stripping voltammetry (SWAdSV) is presented for the first time. The effect of an amplitude (ESW), a frequency (f), a step potential (ΔEs), an accumulation potential (Eacc) and time (tacc), and equilibration time (teq) was investigated. The best analytical signal was obtained in the medium of sulfuric acid on both electrodes. Under optimal analytical conditions, the linear ranges of Oxy concentrations 8.0 × 10−6–5.0 × 10−5 mol L−1 with limit of detection of 2.0 × 10−6 mol L−1 for bare GCE and 6.0 × 10−6–9.0 × 10−5 mol L−1 with limit of detection of 1.1 × 10−6 mol L−1 for GCE/MWCNTs were obtained. To investigate the utility of the proposed method for the determination of oxycarboxin in real samples, a quantitative determination of Oxy was performed in spiked river water samples. The electrode processes of oxycarboxin oxidation were studied by cyclic voltammetry (CV) at both electrodes. The surface characterization of bare GCE and GCE/MWCNTs was evaluated with an atomic force microscopy (AFM) and a scanning electron microscopy (SEM).
Highlights
Oxycarboxin (Oxy, 5,6-dihydro-2-methyl-1,4-oxathiin-3carboxanilide-4,4-dioxide, Fig. 1) is a fungicide belonging to the first-generation succinate dehydrogenase inhibitors (SDHIs)
The purpose of the present work was to develop an electroanalytical procedure for the quantitative determination of oxycarboxin at the glassy carbon electrode (GCE) and the glassy carbon electrode modified with multiwalled carbon nanotubes (GCE/MWCNTs)
A characterization of bare and modified GCE surfaces with different amounts of carbon nanotubes was done by atomic force microscopy (AFM) and scanning electron microscopy (SEM)
Summary
Oxycarboxin (Oxy, 5,6-dihydro-2-methyl-1,4-oxathiin-3carboxanilide-4,4-dioxide, Fig. 1) is a fungicide belonging to the first-generation succinate dehydrogenase inhibitors (SDHIs). Oxy is very effective in the control of plant diseases caused by Basidiomycetes, such as smuts of cereals, rusts of grasses, pines, rose family, coffee, etc. It is used as a chemical agent for Andrzej Leniart, Mariola Brycht, Barbara Burnat ISE Member. In order to improve the sensitivity and detection limit of the bare carbon-based electrodes, the modification of their surfaces can be performed with nanomaterials, such as for example graphene [18,19,20,21,22], carbon nanotubes [23,24,25,26], metal nanoparticles [21, 27, 28], etc. Nanomaterials exhibit extraordinary electrical and physical properties, and they are very often used for the electrode surface modifications
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