A Novel Carbon Paste Electrode for Potentiometric Determination of Vanadyl Ion
| Autor: | Darroudi, A., Eshghi, H., Rezaeian, S., Chamsaz, M., Bakavoli, M., Haghbeen, K., Hossein Eshghi |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Iranian Journal of Chemistry & Chemical Engineering, Vol 34, Iss 4, Pp 89-96 (2015) Scopus-Elsevier |
| ISSN: | 1021-9986 |
| Popis: | Carbon paste electrode was modified by disodium 2,4-diamino-7-methylbenzo[g] pteridine-5,10-dioxide to fabricate a sensor for potentiometric determination of vanadyl ion (VO2+) in aqueous medium. The new ligand was synthesized in three steps with high yield. The optimal composition of the carbon paste was made of graphite powder (64.5%), ionophore (16.6%), paraffin oil (17.8%), and sodium tetraphenylborate (NaTPB, 1.1%). The electrode exhibited a constant sensitivity of 30.20 ± 0.5 mV to VO2+ ions over a concentration range of 5 mM to 1 mM. The detection limit was calculated to be 5 mM with a response time of less than 35 s. The electrode showed to be highly reproducible over a period of 3 weeks. This sensor exhibits high selectivity to VO2+ ions and was successfully employed for potentiometric titration of VO2+ ions with EDTA. |
| Databáze: | OpenAIRE |
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