Electroanalysis of the Herbicide Diquat by Electrochemical Detector Containing Particles of Clay in Environmental Water


1 Department of Chemistry and Environment, Laboratory of Chemical Processes and Applied Materials, Sultan Moulay Slimane University, Faculty of Science and Technology, Beni Mellal, Morocco

2 Department of Chemistry and Physics, Sultan Moulay Slimane University, Polydisciplinary Faculty, Khouribga, Morocco

3 Department of Chemistry, Laboratory of Chemical Processes and Applied Materials, Sultan Moulay Slimane University, Polydisciplinary Faculty, Beni Mellal, Morocco

4 Department of Chemistry and Environment, Molecular Electrochemistry and Inorganic Materials team, Sultan Moulay Slimane University, Faculty of Science and Technology, Beni Mellal, Morocco


Clay modified carbon paste electrode (CPE-C) its applicability for electroanalysis of N, N’-ethylene-2,2’-bipyridinium (diquat) has been described in the present work. Electrochemical modification was performed by electronic impedance spectroscopy (EIS) and cyclic voltammetry (CV) in the range of -0.6 V to 1.2 V in 0.1 M K2SO4 (pH 3). The voltammetric method behavior of DQ is suggested where an anodic and cathodic peak appeared at Epa=0.55 V and Epc=0.1 V, successively. These peaks obtained from the reversible redox of DQ at the CPE-C surface. The optimal preconcentration time and percentage of clay insert were 10 min and 20% respectively. The proposed method exhibits certainly an electro-catalytic success toward DQ redox. The peaks current recorded using cyclic voltammetry has been linearly dependent on the DQ concentration ranging from 1×10-5 to 5×10-5 molL-1. The detection limit (DL) calculated for the anodic peak is 5.33×10-8 molL-1. Then relative standard deviation for 2×10-5 molL-1 diquat has been 4.3% for nine repetitions. The proposed detector has been successfully applied for DQ electroanalysis in a river water sample with a DL of 8.17×10-8 molL-1.


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