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Polarographic study of the herbicide metamitron
Author(s) -
Olmedo Carlos,
Deban Luis,
Vázquez Dolores,
Pardo Rafael,
Palmero Susana
Publication year - 1994
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.1140060814
Subject(s) - polarography , adsorptive stripping voltammetry , chemistry , detection limit , adsorption , stripping (fiber) , voltammetry , electrochemistry , cyclic voltammetry , molecule , analytical chemistry (journal) , inorganic chemistry , nuclear chemistry , chromatography , electrode , organic chemistry , materials science , composite material
The electrochemical characteristics of the herbicide metamitron have been studied in the pH range 1 to 9 by applying several polarographic techniques, namely DCP, TAST, and DPP, adsorptive stripping voltammetry, and cyclic voltammetry with HMDE. The reduction of this molecule evolves in four processes in pHs lower than 3, and in two steps between pH 3 and 9. All processes involve two electrons, are irreversible, and imply the reduction of the functions CN and N‐NH 2 that are present in the molecule. Also, an adsorption phenomenon was observed in several processes. The quantitative determination of metamitron can be carried out in an acetate medium (pH4.6), by applying DPP, with a detection limit of 50 μg/L and using adsorptive stripping voltammetry, reaching a detection limit of 0.5 μg/L. Assays of commercial samples are illustrated.