Electrochemical behavior of simetryn herbicide at water|1,2-dichloroethane interface

VELÁZQUEZ-MANZANARES, MIGUEL; AMADOR-HERNÁNDEZ, JUDITH; MARTÍNEZ, HUMBERTO GARCÍA; DE LA GARZA RODRÍGUEZ, ILIANA M.; YUDI, LIDIA MABEL; COLUNGA URBINA, EDITH M.

JOURNAL OF THE ELECTROCHEMICAL SOCIETY

ELECTROCHEMICAL SOC INC

Año: 2019 vol. 166 p. 286 - 290

0013-4651

Herein, the electrochemical behavior of the simetryn herbicide at the water|1,2-dichloroethane interface was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. Parameters such as transfer Gibbs energy, ionic partition coefficient, and the apparent rate constants across the interface were evaluated. According to the results, the ionic form of this herbicide is highly hydrophobic because Δw o G0 SIMH w→o + is 3.57 kJ mol−1 and logPSIMH 0 + is −0.622. In addition, the ionic partition diagram for this compound shows dual behavior as a function of pH: when pH < pKa, simetryn is transferred as a whole protonated molecule across the interface; whereas, when pH > pKa, simetryn serves as a mobile proton carrier across the interface. The present study offers some important insights that help in understanding the partitioning and kinetic processes of environmentally important molecules across biological membranes.