title: Construction and analytical applications of plastic membrane electrode for oxymetazoline hydrochloride.
abstract: 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 degrees C within the concentration range of 1.96 x 10(-5) - 1 x 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%.
authors.affiliation: Chemistry Department, Faculty of Science, Cairo University, Cairo, Egypt.
authors.forename: Y M
authors.initials: YM
authors.lastname: Issa
authors.forename: S I M
authors.initials: SI
authors.lastname: Zayed