Abstract
The electrochemical oxidation of fipronil is investigated on unmodified and multi-walled carbon-nanotube (MWCNT)-modified glassy carbon electrodes (GCEs), and its amperometric determination using batch injection analysis (BIA) is demonstrated. An oxidation peak was observed at 1.5 V in a 0.1 mol L−1 HClO4/acetone solution (50:50, v/v) on both surfaces. Although MWCNT-modified GCE provided greater sensitivity, the unmodified GCE showed low RSD value, wider linear range, and reduced adsorption of fipronil or its oxidized products on the electrode surface. A detection limit of 4.7 μmol L−1 and linear range of 25–300 μmol L−1 were obtained using a bare GCE. The method was applied in veterinary formulations with results in agreement with those obtained by high-performance liquid chromatography.
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The authors are grateful to FAPEMIG (PPM-00236-12), CNPq (308174/2013-5 and 481086/2012-9), and CAPES for the financial support.
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Montes, R.H.O., Dornellas, R.M., Silva, L.A.J. et al. Amperometric determination of the insecticide fipronil using batch injection analysis: comparison between unmodified and carbon-nanotube-modified electrodes. J Solid State Electrochem 20, 2453–2459 (2016). https://doi.org/10.1007/s10008-015-3085-3
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DOI: https://doi.org/10.1007/s10008-015-3085-3