Potentiometric stripping analysis is an electrochemical
method for the determination of trace concentration of
some heavy metals [1–7]. Similar to anodic stripping
voltammetry techniques, it consists of a potentiostatic deposition
and a subsequent stripping step. The deposition
step in PSA is the same as in the anodic stripping voltammetry,
i.e., the simultaneous reduction and amalgamation
of traces of the analyte element or elements on a mercurycoated
glassy carbon electrode. The stripping step is,
however, fundamentally different from that used in anodic
stripping voltammetry. The reduced analytes are re-oxidized
chemically from the amalgam and the change of potential
with time is recorded. There are two important advantages
of potentiometric stripping analysis over anodic
stripping techniques [2]. The principles of PSA make possible
the use of very simple instrumentation (no sample