Electrochemical and quantum chemical investigations of the insecticide fipronil.
Electrochemical and quantum chemical investigations of the insecticide fipronil.
Author(s): OKUMURA, F.; AMARAL, R. B.; ORESTES, E.; SILVA, A. B. F.; MAZO, L. H.
Summary: This work describes an electrochemical and quantum chemical investigation of the fipronil insecticide. Cyclic voltammetry (CV) and square wave voltammetry (SWV) experiments were performed over a graphite-polyurethane (GPU) composite electrode. The fipronil molecule presents an one?electron irreversible oxidation reaction. Profiting the SWV signal a square wave stripping voltammetry (SWSV) procedure to determine the fipronil molecule in a 0.10 mol L-1 Britton-Robinson buffer solution, pH 8.0 was developed with accumulation potential and time of 0.50 V and 120 s, respectively. The limits of detection and quantification were 0.80 and 2.67 ?g L-1, respectively. Recovery tests were performed in three natural waters samples with values ranging from 99.67 to 101.37%. Quantum chemical studies showed that the nitrogen atom of the pyrazole group is the most probable oxidation site of the fipronil molecule.
Publication year: 2016
Types of publication: Journal article
Unit: Embrapa Maize & Sorghum
Keywords: Química
Observation
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