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Determination of the pesticide guthion by flow‐injection analysis with amperometric detection
Author(s) -
Méndez J. Hernández,
Martínez R. Carabias,
Gonzalo E. Rodríguez,
Trancon J. Pérez
Publication year - 1990
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140020612
Subject(s) - detection limit , amperometry , flow injection analysis , relative standard deviation , chemistry , chromatography , anthranilic acid , alkaline hydrolysis , hydrolysis , pesticide , flow (mathematics) , electrode , organic chemistry , mathematics , electrochemistry , agronomy , biology , geometry
Guthion, a pesticide, was determined by flow‐injection analysis using single‐ and three‐channel systems with and without a chemical reaction. The experimental variables involved in each case were investigated and optimized, and the analytical features of the two procedures were compared. A method based on the oxidation of anthranilic acid yielded in the alkaline hydrolysis of the pesticide at a glassy carbon electrode is proposed for its determination. The detection limit is 4.1 × 10 −7 M, and the relative standard deviation is 2.2% (n = 10) when the hydrolysis reaction takes place within the threeenamel manifold.