Characterization of ammonium ion — Sensitive membranes in solution with electrochemical impedance spectroscopy

The electrochemical impedance spectroscopy is used to study the behaviour of a CWE electrode modified with a thin layer of polymeric membrane, in order to detect ammonium ions in solution. This membrane involves the incorporation of a zeolite type ionophore (clinoptilolite) into a polymer (polyvinyl chloride), and a plasticizing agent (dioctylphtalate). The ionic exchanges are characterized using electrochemical impedance spectroscopy. The CWE shows a good sensitivity and a low detection limit of about 10− 8 M.