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.