Abstract − Analytical Sciences, 20(2), 297 (2004).
Construction and Analytical Applications of Plastic Membrane Electrode for Oxymetazoline Hydrochloride
Y. M. ISSA* and S. I. M. ZAYED**
*Chemistry Department, Faculty of Science, Cairo University, Cairo, Egypt
**Faculty of Industrial Education, Beni Suef, Egypt
**Faculty of Industrial Education, Beni Suef, Egypt
A new oxymetazoline (OM) ion-selective PVC membrane electrode based on the ion associate of OM with phosphotungstic acid was prepared. The electrode exhibits a linear response with a mean calibration graph slope of 57.16 mV decade-1 at 25°C within the concentration range of 1.96 × 10-5 - 1 × 10-2 M OMCl. The change in the pH within the range of 1.0 - 9.4 did not affect the electrode performance. The standard electrode potentials were determined at different temperatures and used to calculate the isothermal coefficient of the electrode (-0.001233 V). The electrode showed a very good selectivity for OM with respect to a large number of inorganic cations and compounds. The standard addition method and potentiometric titration were applied to the determination of (OM) with RSD not exceeding 1.19%.
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