a novel carbon paste electrode for potentiometric determination of vanadyl ion
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abstract
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.
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Journal title:
iranian journal of chemistry and chemical engineering (ijcce)Publisher: iranian institute of research and development in chemical industries (irdci)-acecr
ISSN 1021-9986
volume 34
issue 4 2015
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