Location of Repository

Quantificação do pesticida diclorvos por voltametria de onda quadrada em águas puras e naturais

By Oliveira Robson T. S. and Machado Sergio A. S.


This work reports the use of square wave voltammetry (SWV) to analyse the electrochemical reduction of dichlorvos (2, 2-dichlorovinyl-dimethylphosphate) in spiked pure and natural waters. SWV measurements were carried out in 0.5 mol L-1 Na2SO4 aqueous solutions at pH 5, prepared with water originated from three different sources, namely, one sample of purified water and others from two urban creeks in São Carlos County. In all cases, two reduction peaks were observed, at potentials of -0.15 and -1.05 V vs Ag/AgCl, with both current and potential being dependent on pesticide concentration. This allowed the calculation of the following detection limits: 1.0, 2.5 and 3.0x10-8 mol L-1 for purified, Gregorio creek and Monjolinho creek waters, respectively, in a working range between 2.0x10-7 and 1.4x10-6 mol L-1. Recovery measurements found values higher than 80% in all cases, for an added concentration of 4.0 x 10-7 mol L-1 of dichlorvos in each solution. All analytical experiments were performed in triplicate and showed a standard deviation always less than 3%

Topics: dichlorvos, electroanalysis, pesticides, Chemistry, QD1-999, Science, Q, DOAJ:Chemistry (General), DOAJ:Chemistry
Publisher: Sociedade Brasileira de Química
Year: 2004
OAI identifier: oai:doaj.org/article:2dea39adad32427690905de14eecdbf1
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://doaj.org/toc/1678-7064 (external link)
  • https://doaj.org/toc/0100-4042 (external link)
  • http://www.scielo.br/scielo.ph... (external link)
  • https://doaj.org/article/2dea3... (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.