Determination of the fungicide kresoxim-methyl in grape juices using square-wave voltammetry and a boron-doped diamond electrode

作者：Dornellas Rafael M; Franchini Romulo A A; da Silva Andrea R; Matos Renato C; Aucelio Ricardo Q^*

来源：Journal of Electroanalytical Chemistry, 2013, 708: 46-53.

DOI：10.1016/j.jelechem.2013.09.015

• Boron-doped diamond electrode
• Square-wave voltammetry
• Kresoxim-methyl
• Grape juice

A square-wave voltammetric method for the determination of kresoxim-methyl in grape juices was developed using the nanocrystalline boron-doped diamond electrode where an irreversible oxidation occurred. Measurements were made through the anodic scan from +1000 to +1750 mV (Maximum at +1420 mV) in pH 4.0 acetate buffer 0.050 mol L-1. Linear signal response (R-2 > 0.999) expanded form the 8.7 x 10(-7) mol L-1 (0.27 mg L-1) up to 3.4 x 10(-5) mol L-1 (11 mg L-1). The method was applied in the analysis of analyte fortified grape juices. Solid phase extraction allowed pre-concentration of the analyte and eliminated interferences imposed by sample matrix. Recoveries from 91.6% to 105.3% were found and agreed with results achieved using high performance liquid chromatography.

• 出版日期2013-11-1