Use of membranes for equivalence point indication-VIII Electrochemical characterization of BaSO(4)-parchment membrane-electrode

Some new aspects of the electrochemical characterization of the BaSO(4)-parchment membrane-electrode are discussed. The electrode function E vs. pH is strongly affected by the ionic strength of the external solution. The electrode is mainly selective for hydrogen, and without interference from sodium ions. The basis of operation of the electrode is selective diffusion. This conclusion is supported by the temperature coefficient, the response rate, and the impedance measurements.