Determination of Pb2+ ions by a modified carbon paste electrode based on multi-walled carbon nanotubes (MWCNTs) and nanosilica |
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| Authors: | Mohammad Reza Ganjali Negar Motakef-Kazami Farnoush Faridbod Sepideh Khoee Parviz Norouzi |
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| Affiliation: | 1. Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran;2. Endocorinology & Metabolism Research Center, Medical Sciences, University of Tehran, Tehran, Iran;3. Polymer Laboratory, Chemistry Department, School of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran;1. Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran;2. Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran;1. School of Chemistry, College of Science, University of Tehran, Tehran, Iran;2. Department of Chemistry, Alzahra University, Tehran, Iran;3. Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran;4. Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran;1. Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran;2. Department of Chemistry, Graduate University of Advanced Technology, Kerman, Iran;3. NanoBioElectrochemistry Research Center, Bam University of Medical Sciences, Bam, Iran;4. Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran;5. Biosensor Research Center, Endocrinology & Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran;1. Center of Excellence in Electrochemistry, University of Tehran, Tehran, Iran;2. Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India;3. Diabetes Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran;4. Research Institute of Petroleum Industry (RIPI), Tehran, Iran;5. Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran |
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| Abstract: | A novel carbon paste ion selective electrode for determination of trace amount of lead was prepared. Multi-walled carbon nanotubes (MWCNTs) and nanosilica were used for improvement of a lead carbon paste sensor response. MWCNTs have a good conductivity which helps the transduction of the signal in carbon paste electrode. The electrode composition of 20 wt% paraffin oil, 57% graphite powder, 15% ionophore (thiram), 5% MWCNTs, and 3% nanosilica showed the stable potential response to Pb2+ ions with the Nernstian slope of 29.8 (±0.2) mV decade?1 over a wide linear concentration range of 10?7–10?2 mol L?1. The electrode has fast response time, and long term stability (more than 2 months). The proposed electrode was used to determine the concentration of lead ions in waste water and black tea samples. |
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