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Updated: Feb 6, 2026

Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride
Published on: July 1, 2020
Polished silver solid amalgam electrode and cationic surfactant as tool in electroanalytical determination of
Caio César Gonçalves Silva1, Djenaine De Souza1
1Laboratório de Eletroanalítica Aplicada a Biotecnologia e a Engenharia de Alimentos - LEABE, Campus de Patos de Minas, Instituto de Química, Universidade Federal de Uberlândia, Av. Getúlio Vargas, 230, Centro 38700 - 128, Patos de Minas, MG, Brazil.
Abstract:
The polished silver solid amalgam electrode (p-AgSAE) combined with square wave voltammetry (SWV) was used in the development of an analytical procedure to Methomyl determination in natural water samples. The experimental and voltammetric parameters were optimized and the use of cationic surfactant cetyltrimethyl ammonium bromide promoted a considerable change in the kinetic and mechanism of the Methomyl reaction. Was observed the presence one-single reduction peak, related to a totally irreversible two-electrons transfer, followed by chemical reaction involving two protons. Analytical parameters (linearity range, analytical curve equations, correlation coefficient, detection and quantification limits, recovery efficiency, and relative standard deviation for intraday and interday experiments) were evaluated indicating that the proposed voltammetric procedure is suitable for determination of Methomyl. The application of the proposed procedure in natural water analysis indicated high robustness with only simple filtration, without pre-concentration steps, good stability and suitable sensitivity to determination of Methomyl in natural water samples.
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