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Electrochemical Reduction of Prometryne and the Other 2‐Methylthio‐4,6‐dialkylamino‐ s ‐triazine Herbicides at Mercury Electrodes
Author(s) -
Skopalová Jana,
Lemr Karel,
Kotouček Milan,
Čáp Lubomír,
Ondra Petr
Publication year - 1998
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/(sici)1521-4109(199804)10:5<331::aid-elan331>3.0.co;2-6
Subject(s) - coulometry , polarography , chemistry , electrolysis , electrochemistry , triazine , cyclic voltammetry , dropping mercury electrode , aqueous solution , inorganic chemistry , electrode , protonation , ion , organic chemistry , electrolyte
Abstract The electrochemical behavior of the herbicide prometryne was studied in aqueous solutions by DC polarography, differential pulse and cyclic voltammetry and by constant potential coulometry. Only the protonated form of prometryne can be reduced at pH < 6.5. The electrode process includes two irreversible steps. The two‐electron reduction of the C–S bond leads to its splitting and a release of methylthiol molecule. The triazine ring of the reduction product is immediately reduced under the uptake of two electrons. Both the intermediate and final products of constant potential electrolysis were identified using chromatographic techniques and mass spectrometric analysis. The reduction mechanism of other 2‐methylthio‐4,6‐dialkylamino‐ s ‐triazines is identical.