A polyethylene terephthalate membrane electrode based on clinoptilolite as the ionophore was prepared and was deposited on a gold electrode. This one was characterised with electrochemical impedance spectroscopy and modelled with an equivalent electric circuit. The detection of ammonium at low concentrations and the interaction with the other cations were made by impedance measurements. The study of the interaction of ammonium ions in presence with the cations such as Na+, Ca2+ and K+ in the same concentration showed that the electrode is selective and sensitive for very low concentrations 10−7 mol/l, but the membrane is saturated for concentrations greater than 10−2 M. The life expectancy of the membrane exceeded 50 days when we changed the PBS solution after 44 days.
Research on Chemical Intermediates – Springer Journals
Published: Oct 16, 2013
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