COMMISSION ON ELECTROANALYTICAL CHEMISTRY
Sulfate-sensing electrodes. The lead- amalgam/lead-sulfate electrode
(IUPAC Technical Report)
Patrizia R. Mussini and Torquato
Department of Physical Chemistry and Electrochemistry,
University of Milan, Via Golgi 19, I-20133 Milano, Italy
Abstract: A new, simplified design and a convenient preparation
procedure for the Pb(Hg)|PbSO4|SO42-
electrode are proposed. This procedure ensures preparation of stable
amalgams and reproducible electrode potentials, which make this electrode
useful and attractive for both thermodynamic investigations and electroanalytical
applications. For these purposes, the electrode prepared according to
the proposed procedure has been exhaustively characterized both thermodynamically
and as a sulfate-sensing electrode, in different sulfate solutions,
including H2SO4. Also, a practical standardization
procedure has been proposed. The Pb(Hg)|PbSO4|SO42-
electrode can be structured with a built-in concentrated Li2SO4
salt bridge for use as a sulfate-based reference electrode. This electrode
can be operated as a reference electrode alternative to the conventional
calomel or Ag|AgCl reference electrodes in electroanalytical practice.
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