4.7 Article

A non-mercury electrode for the voltammetric determination of butralin in foods

期刊

FOOD CHEMISTRY
卷 343, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.128419

关键词

Bimetallic nanoparticles; Electroanalysis; Pesticide; Foods

资金

  1. CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
  2. CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
  3. FAPESC (Fundacao de Amparo a Pesquisa e Inovacao do Estado de Santa Catarina)
  4. LCME/UFSC (Laboratorio Central de Microscopia Eletronica da Universidade Federal de Santa Catarina)

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In this study, a modified electrode with Co-Ag bimetallic nanoparticles stabilized in poly(vinylpyrrolidone) was developed for the quantification of butralin, providing a non-mercury alternative. The electrode was characterized using spectroscopic and microscopic techniques, and optimized experimental parameters led to linear calibration plots for butralin in honey and apple jam samples. The results obtained were validated by UV-vis spectrometry and statistical tests.
A modified electrode was developed with Co-Ag bimetallic nanoparticles stabilized in poly(vinylpyrrolidone) for butralin monitoring. This is the first non-mercury electrode proposed for the quantification of butralin. The bimetallic nanoparticles were characterized by spectroscopic and microscopic techniques, which showed that they are composed of a cobalt core partially covered with silver. The modified electrode was characterized by field emission gun scanning electron microscopy, energy dispersive X-ray spectroscopy and electrochemical impedance spectroscopy. The experimental parameters (pH, supporting electrolyte, accumulation step, pulse technique) were optimized. The calibration plot for butralin obtained by square wave voltammetry was linear in the range of 0.1-1.0 mu mol L-1 with limits of detection and quantification of 32 and 106 nmol L-1, respectively. Lastly, the modified electrode was effectively implemented in the quantification of butralin in honey and apple jam samples. The results were in agreement with those furnished by UV-vis spectrometry and endorsed by statistical tests.

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