Electrochemical and Quantum Chemical Investigations of the Insecticide Fipronil

Journal of the Brazilian Chemical Society

Mazo, Luiz Henrique¹  Orestes, Ednilsom¹  Silva, Albérico B. F.¹  Empresa Brasileira de Pesquisa Agropecuária, Sete Lagoas, Brazil¹  Universidade de São Paulo, São Carlos, Brazil¹  Okumura, Fabiano¹  Universidade Federal Fluminense, Volta Redonda, Brazil¹  Amaral, Raquel B.¹ 

关键词:  fipronil;    graphite-polyurethane;    square wave voltammetry;    density-functional theory;   

DOI  :  10.5935/0103-5053.20150347

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

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 μg 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.

【 授权许可】

Unknown