Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7149835 | Sensors and Actuators B: Chemical | 2012 | 10 Pages |
Abstract
A novel modified carbon paste electrode with vinylferrocene/multiwall carbon nanotubes was fabricated. The electrochemical response of the modified electrode toward morphine was studied by means of cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). The structural morphology of the modified electrode was characterized by SEM technique. The prepared electrode showed an excellent electrocatalytic activity in the oxidation of morphine, leading to remarkable enhancements in the corresponding peak currents and lowering the peak potential. Using square wave voltammetry (SWV), we could measure morphine and diclofenac in one mixture independently from each other by a potential difference of about 300 mV for the first time. Square wave voltammetric peaks current of morphine and diclofenac increased linearly with their concentrations in the ranges of 0.2-250.0 μmol Lâ1, and 5.0-600.0 μmol Lâ1, respectively. The detection limits of 0.09 and 2.0 μmol Lâ1 were achieved for morphine and diclofenac, respectively. The proposed voltammetric sensor was successfully applied to the determination of morphine and diclofenac in real samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ali Mokhtari, Hassan Karimi-Maleh, Ali A. Ensafi, Hadi Beitollahi,