Diltiazem-tetraiodide bismuthate (III) based PVC membrane for selective determination of diltiazem hydrochloride

Authors

  • Ryad Kassab Department of Analytical Chemistry, Faculty of Sciences, University of Aleppo, Aleppo, Syria.
  • Mahmoud Aboudan Department of Analytical Chemistry, Faculty of Sciences, University of Aleppo, Aleppo, Syria.

DOI:

https://doi.org/10.24297/jac.v19i.9378

Keywords:

Tetraiodido bismuthate (III) , Selectivity coefficient, Nernstian response, Ion-pairing agent, Diltiazem hydrochloride

Abstract

A new coated-wire electrode based on PVC membrane plasticized with dioctyl phthalate (DOP) and containing the diltiazem-tetraiodido bismuthate (III) ion association coated on a silver wire was constructed and used for potentiometric determination of diltiazem hydrochloride. The electrode performance was characterized and optimized according to the following experimental criteria: membrane composition, soaking time, working pH range, and response time. The interference caused by different species was investigated as well. The best membrane composition was found to be 49.75% of PVC and DOP, 0.5% ion pair. This sensor showed a linear response with a good Nernstian slope of 57.60±1.38 mV/decade over the concentration range
5.0×10-5 – 2.50×10-2 M, the detection limit was 2.88×10-5 M, and it was usable within a wide pH range of
2.5–8.0. The electrode showed a fast response time (18 sec), with a relative long lifetime (2.4 months, 2 h a day). The isothermal coefficient (dE°/dT) of the electrode was calculated and found to be 5.36×10-4 V/℃ within
20 – 80℃, which exhibits a good thermal stability. The coted-wire electrode was successfully applied for the potentiometric determination of diltiazem hydrochloride both in pure form and pharmaceutical preparations. The dissolution test of the drug was carried out as well.

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Published

2023-03-06

How to Cite

Kassab, R. ., & Aboudan, M. . (2023). Diltiazem-tetraiodide bismuthate (III) based PVC membrane for selective determination of diltiazem hydrochloride. JOURNAL OF ADVANCES IN CHEMISTRY, 19, 1–9. https://doi.org/10.24297/jac.v19i.9378

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