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 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.
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Sadeghi, S., Gafarzadeh, A. & Naeimi, H. PVC-based Cu (II)-Schiff base complex membrane coated graphite electrode for the determination of the triiodide ion. J Anal Chem 61, 677–682 (2006). https://doi.org/10.1134/S1061934806070136
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DOI: https://doi.org/10.1134/S1061934806070136