Silver nanoparticle-modified electrode for the determination of nitro compound-containing pesticides

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• 作者：Camila Alves de Lima ; Edson Roberto Santana…
• 关键词：Silver nanoparticles ; Modified electrode ; Pesticides ; Water ; Foods
• 刊名：Analytical and Bioanalytical Chemistry
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：408
• 期：10
• 页码：2595-2606
• 全文大小：448 KB
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• 作者单位：Camila Alves de Lima (1)
  Edson Roberto Santana (1)
  Jamille Valéria Piovesan (1)
  Almir Spinelli (1)
  
  1. Departamento de Química–CFM, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, 88040-900, Florianópolis, Santa Catarina, Brazil
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Food Science
  Inorganic Chemistry
  Physical Chemistry
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-2650

文摘

This paper reports the electroanalytical determination of pendimethalin and ethyl parathion by square-wave adsorptive stripping voltammetry using a material comprised of chitosan-stabilized silver nanoparticles to modify a glassy carbon electrode. Under optimized experimental conditions, the peak current was found to vary linearly with the concentration of pendimethalin in the range of 70 to 2000 nmol L−1 and with concentration of ethyl parathion in the range of 40 to 8000 nmol L−1. Detection limits of 36 and 40 nmol L−1 were obtained for pendimethalin and ethyl parathion, respectively. The silver - nanoparticle-modified electrode was successfully employed for the analysis of pesticides in tap and mineral water (pendimethalin) and in lettuce and honey (ethyl parathion) samples. Pendimethalin recovery was between 94 and 100 %, and ethyl parathion recovery was between 97 and 101 %, indicating no significant matrix interference effects on the analytical results. The accuracy of the electroanalytical methodology using the proposed modified electrode was also compared to that of the UV–vis spectrophotometric method.