Carbon Paste Electrode Modified with Functionalized Nanoporous Silica Gel as a New Sensor for Determination of Silver Ion |
| |
| Authors: | Mehran Javanbakht Mohammad Reza Ganjali Parviz Norouzi Alireza Badiei Abed Hasheminasab Majid Abdouss |
| |
| Affiliation: | 1. Department of Chemistry, Amirkabir University of Technology, Tehran, Iran;2. Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran;3. Endocrine & Metabolism Research Center, Tehran University of Medical Sciences, Tehran, Iran;4. School of Chemistry, University College of Science, University of Tehran, Tehran, Iran |
| |
| Abstract: | A new dipyridyl‐functionalized silica gel (DPSG) was synthesized. The potentiometric response of silver ion was investigated at a carbon paste electrode chemically modified with functionalized nanoporous silica gel. The electrodes with a DPSG proportions of 10.1% (w/w), showed very stable potential. Calibration plots with Nernstian slopes for Ag+ were observed, 58.7 (±0.9) mV decade?1, over a wide linear range of concentration (5.0×10?7 to 1.0×10?1 M). The electrode has a detection limit of 1.0×10?7 M. The selectivity coefficients measured by the match potential method in acetate buffer, pH 5.5, were investigated. The electrode has fast response time, high performance, high sensitivity in wide cation activity ranges, and good long term stability (more than 6 months). The method was satisfactory and used to determine the concentration of silver ion in waste waters contaminated by this metal. |
| |
| Keywords: | Potentiometric Electrode Nanoporous Silica gel Silver Carbon paste |
|
|
