Research Article Open Access

Plastic Membrane Electrodes of Coated Wire Type for Micro Determination of Quininium Cation in Pharmaceutical Tablets

Laila Abdullah Al Shatti1, Hayat Mohammed Marafie2 and Adel Fahmi Shoukry2
  • 1 Department of General Science, College of Nursing, The Public Authority for Applied Education and Training, Kuwait
  • 2 Department of Chemistry, Faculty of Science, Kuwait University, Kuwait


Problem statement: Silver and copper all-solid state wire sensor electrodes of quininium cation with different ion exchangers have been prepared and used in pharmaceutical analysis. A comparative study with a reference method is applied in order to investigate the validity of the proposed method for potentiometric analysis of pharmaceutical compounds containing quinine. Approach: A Nernstian equation was proved for all electrodes of quinine in this research. Potentiometric investigations were carried out to identify the characteristic performance of the electrodes, such as the life span, pH effect and effect of the interfering ions. Chemometric and statistical studies of the chemical analysis of quinine in pharmaceutical compounds were applied using different type of electrodes compared to a reference method. Results: A Polyvinyl Chloride (PVC) membrane electrodes of silver (Ag) and Copper (Cu) Coated Wire Electrodes (CWEs) were prepared for quininium cation (Qn+). The ion exchangers were ion-pairs and ion associates of Qn+ with different counter-anions, such as reineckate (Rn-), phosphotungstate (PT3-) and phosphomolybdate (PM3-). The Qn-CWEs showed a Nernstian response for a maximum 24 h at 25°C, except with that based on Cu- Qn3PM.Conclusion/Recommendations: The ion pair QnRn and the ion associates Qn3PT and Qn3PM are very efficient ion exchangers for the construction of Qn-CWEs. The performance characteristics (life span, pH effect and the selectivity) proved that such electrodes can be successfully used for the potentiometric micro-determination of Qn2SO4 in its pharmaceutical preparation. The analytical application showed that the recoveries and relative standard deviation of different Qn-CWEs reveals a high degree of accuracy and precision. In spite of their high accuracy, the F- test conclude the fact that the reference method is usually more precise than proposed method introduced in this study except for Ag-Qn3PM electrode. In general, Ag-Qn3PM CWE showed a discrete behavior regarding accuracy and silver metal preference. Further application of this type of electrodes on different pharmaceutical compounds is recommended to countervail the trends on the performance characteristics and confront the statistical parameters.

American Journal of Applied Sciences
Volume 8 No. 2, 2011, 116-123


Submitted On: 27 December 2010 Published On: 28 February 2011

How to Cite: Shatti, L. A. A., Marafie, H. M. & Shoukry, A. F. (2011). Plastic Membrane Electrodes of Coated Wire Type for Micro Determination of Quininium Cation in Pharmaceutical Tablets. American Journal of Applied Sciences, 8(2), 116-123.

  • 8 Citations



  • Most ion-Selective Electrodes (ISEs)
  • Phosphotungstic Acid (PTA)
  • polyvinyl chloride
  • pharmaceuticals samples
  • Separate Solution Method (SSM)
  • Matched Potential (MPM)
  • pharmaceutical compounds
  • reference method
  • plastic membrane