Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 16, Issue 3, Pages 1151-1159Publisher
SPRINGER
DOI: 10.1007/s10008-011-1500-y
Keywords
Thiobencarb; EDPE; Electrocatalytic activity; Modified electrode; Voltammetric measurements
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Funding
- post-graduate office of Guilan University
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Cyclic voltammetry, chronoamperometry, and rotating disk electrode voltammetry were used to investigate the electrochemical behavior of thiobencarb (TB) at carbon paste electrode modified with an azo dye, 2-(4-((4-ethoxyphenyl)diazenyl)phenylamino)ethanol (EDPE), EDPE/modified carbon paste electrode (MCPE). The modified electrode showed high electrocatalytic activity toward thiobencarb. The current was enhanced significantly relative to the situation prevailing when a bare glassy carbon electrode was used. The kinetics parameters of this process were calculated, the apparent electron transfer rate constant k (s) and alpha (charge transfer coefficient between electrode and EDPE) were 14.6 s(-1) and 0.48, respectively. The experimental parameters were optimized, and the mechanism of the catalytic process was discussed. The best defined cathodic peak was obtained with 0.1 M acetate buffer (pH 3.0). The response of the sensor was very quick, and response time was approximately 5 s. The differential pulse voltammetry response of the MCPE was linear against the concentration of TB in the range of 0.96 to 106 mu g L-1. The limit of detection was found to be 0.025 mu g L-1. The precision was examined by carrying out eight replicate measurements at a concentration of 25 mu g L-1 TB; the relative standard deviation was 2.9%.
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