Enhanced Electrocatalytic Reduction of Oxadiargyl and Its Determination on 2-(4-((4-Acetylphenyl)diazenyl)phenylamino)-ethanol Modified Graphene-Paste Electrode

• Published in: Electroanalysis (New York, N.Y.) Vol. 24; no. 12; pp. 2395 - 2404
• Main Authors: Saber-Tehrani, M., Pourhabib, A., Husain, S. Waqif, Arvand, M.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01-12-2012; WILEY‐VCH Verlag
• Subjects: Charge transfer; Dyes; Electrocatalytic activity; Electrodes; Graphene-paste modified electrode; Mathematical analysis; Oxadiargyl; Rate constants; Rice; Utilities; Voltammetric measurements; Voltammetry
• ISSN: 1040-0397; 1521-4109
• DOI: 10.1002/elan.201200308

The electrochemical behavior of oxadiargyl at a graphene‐paste electrode modified with an azo dye, 2‐(4‐((4‐acetylphenyl)diazenyl)phenylamino)ethanol (ADPE), ADPE/MGRPE was investigated. The modified electrode showed high electrocatalytic activity toward oxadiargyl. The apparent electron transfer rate constant (ks) and charge transfer coefficient (α) between electrode and ADPE were 1.16 s−1 and 0.41, respectively. The differential pulse voltammetry response of the modified graphene‐paste electrode was linear against the concentration of oxadiargyl in the range from 0.03 to 1.4 mg L−1. The limit of detection was found to be 1.3 µg L−1 (S/N=3). The practical analytical utility of this electrode was demonstrated by measurement of oxadiargyl in river water, soil and rice samples.