Behnia N.,Islamic Azad University at Tehran |
Asgari M.,NFCRI |
Feizbakhsh A.,Islamic Azad University at Tehran
Journal of Environmental Chemical Engineering | Year: 2015
A glassy carbon electrode (GCE) modified with zinc ion-imprinted polymers (GC/IIP) was used for the determination of sub-nanomolar amounts of zinc in the tap water samples by means of anodic stripping voltammetry (ASV). The GC/IIP modified electrode revealed a significant improvement for zinc detection compared with the bare GCE. Zinc ion-imprinted polymers were synthesized by thermal polymerization and zinc ions were removed by leaching the IIP by HCl and after drying in the oven, utilized for the electrode modification. The potential was scanned from -0.3 V to +0.4 V versus Ag/AgCl and variable affecting parameters such as pH, deposition duration time, deposition potential and stirring speed were optimized for ASV detection. The resulting calibration curve exhibited a linear response within a concentration range of 5 × 10-10 to 1 × 10-8 M with a low detection limit of 0.5 nM. Finally, the method was successfully applied to the determination of water samples. © 2014 Elsevier Ltd. All rights reserved.
Asgari M.,NFCRI |
Shanehsaz M.,Tarbiat Modares University |
Shamsipur M.,Razi University |
Behzad M.,NFCRI |
Journal of Applied Electrochemistry | Year: 2013
A novel modified electrode was constructed by immobilizing thioglycolic acid-capped CdTe quantum dots (QDs) on a glassy carbon electrode (GCE) using Nafion ionomers. The results obtained by electrochemical impedance spectroscopy, cyclic voltammetry, and rotating disk electrode using the modified QDs-Nafion/GCE in a 0.20 M phosphate buffer of pH 7.0 revealed that the QDs act as effective mediators for the electrocatalytic reduction of dioxygen. © 2012 Springer Science+Business Media Dordrecht.