PVC-based Cu (II)-Schiff base complex membrane coated graphite electrode for the determination of the triiodide ion |
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Authors: | S Sadeghi A Gafarzadeh H Naeimi |
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Institution: | (1) Department of Chemistry, Birjand University, Faculty of Science, P.O. Box 97175-615, Birjand, Iran;(2) Department of Chemistry, Kashan University, Faculty of Science, Kashan, Iran |
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Abstract: | A triiodide-selective electrode based on copper (II)-Schiff base complex as a membrane carrier is proposed. The electrode
was prepared by incorporating the carrier into a plasticized polyvinylchloride (PVC) membrane and was directly coated on the
surface of a graphite electrode. The obtained electrode showed a near Nernstian slope of 57.0 ± 0.4 mV/decade to I
3
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ions over an activity range of 1.0 × 10−5−1.0 × 10−1 M with a limit of detection of 4.8 × 10−6 M. The response time of the electrode was fast (5 s) and the electrode could be used for about 2 months without considerable
divergence in response. The potentiometric selectivity coefficients were evaluated and displayed anti-Hofmeister behavior.
The electrode was used as an indicator electrode in the potentiometric titration of the triiodide ion and in the determination
of ascorbic acid in vitamin C tablets.
The text was submitted by the authors in English. |
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