Plastic Membrane Sensor from a Disposed Combined Glass Electrode. A Project for Graduate and Fourth-Year Undergraduate Students of Analytical Chemistry.

• Autores: Hayat M. Marafie, Adel F Shoukry, Laila A. Alshatti
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 84, Nº 5, 2007, págs. 793-796
• Idioma: inglés
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• Resumen

  • A combined plastic membrane hydralazinium (Hz) selective electrode was constructed from a disposed combined glass electrode. The glass bulb was removed and a plastic membrane containing Hz�reineckate ion pair, as exchanger, was glued to a polyethylene cap fixed in place of the glass bulb. The electrode exhibited average calibration graph slope of (49.1 mV)/(Hz concentration grade) at 25 °C and high selectivity for Hz against several inorganic cations. The electrode was employed to determine the solubility product of the ion pair and as a sensor for potentiometric determination of HzCl by potentiometric titration.