Abstract
Intended for forensic gunshot residue analyses and other applications, a low-cost (about $250.00) polarograph was constructed. This instrument is essentially' an operational amplifier version of a three-electrode potentiostat containing a voltage ramp generator, a scan amplifier, an amplifier and a current-to-voltage converter, two voltage followers and an electrolysis cell. An anodic stripping procedure was developed for the simultaneous determination of a zinc, cadmium, lead, antimony and copper mixture, and used for testing the instrument. Effects of pre-electrolysis time, concentration changes, presence of other species and overlapping were also studied.
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