Electrochemical Oxidation of the Fungicide Dimoxystrobin and Its Amperometric Determination by Batch-Injection Analysis

Abstract

The electrochemical oxidation of dimoxystrobin at a boron-doped diamond electrode is reported. Two well-defined oxidation peaks were observed at around 1350 and 1750 mV in a 0.04 mol L À1 Britton-Robinson buffer solution (pH 10). Based on this electrochemical process, a batch-injection analysis method with amperometric detection was developed for the determination of dimoxystrobin in natural waters. The method presented a high analytical frequency (180 h À1 ), good precision (RSD < 3%, n ¼ 10), and a detection limit of 0.38 lmol L À1 (124 ng mL À1 ). Recovery values obtained using analyte fortified water samples were between 80 and 105%. Additionally, a simple strategy to detect the presence of interfering molecules in water samples based on dual-pulse amperometry is presented.

Electrochemical Oxidation of Astaxanthin on Glassy‐carbon Electrode and its Amperometric Determination Using Batch Injection Analysis (BIA)

“…Possible interferents that undergo electrochemical response under the optimized amperometric conditions (electroactive species that oxidize at +0.8 V) may be present in salmon samples. This drawback could be solved applying dual‐pulse amperometry as previously demonstrated in the literature . Based on the voltammetric profile of astaxanthin (Figures and ) that presents two oxidation processes, two potentials could be selected and applied as a fingerprint of astaxanthin (e.g., +0.8 and +1.2 V).…”

Electrochemical determination of picoxystrobin on boron-doped diamond electrode: Square-wave voltammetry versus BIA-multiple pulse amperometry

“…The high oxidation power of BDD promotes the effective degradation of organic substances due to the production of large amounts of hydroxyl radicals in aqueous solutions [11,12]. In fact, the oxidation of other strobilurins in aqueous solution was achieved using BDD enabling a measured current response for the voltammetric determination of kresoxy-methyl [13] and pyraclostrobin [14] and the amperometric determination of dimoxystrobin [15].…”

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

“…With the respect to the commonly known disadvantages of HMDE, especially the toxicity of liquid mercury (more precisely the toxicity of mercury vapors or its organometallic compounds) and mechanical instability of mercury drop, it would be more preferable to use another working electrode. Due to the fact, that several papers focused on the determination of some other strobilurin fungicides (e. g., picoxystrobin, pyraclostrobin, kresoxim‐methyl, trifloxystrobin, dimoxystrobin) using boron‐doped diamond electrode (BDDE) have been published , this working electrode was applied also for study of the electrochemical behavior of AS and for the development of voltammetric method for its determination in the present paper. Boron‐doped diamond is universal electrode material used in electroanalytical chemistry in form of thin polycrystalline films .…”