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Abstract
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The voltammetric characteristics of Bi(III) oxinate at the mercury electrode in chloroform are investigated. Anodic stripping
voltammetry (ASV) for the determination of trace bismuth was developed in chloroform, using the differential pulse technique
to strip the amalgamated bismuth from hanging mercury drop electrode (HMDE). The experimental variables such as scan
rate of electrode potential, deposition potential, deposition time and stirring speed were optimized. The linear range of
calibration graph and the detection limit were 5 × 10−8 to 5 × 10−6 and 3.5 × 10−9M for Bi(III), respectively. Preceded by
a preconcentration stage by solid phase extraction using octylsilane (RP-8) cartridge and subsequent elution by chloroform,
the detection limit of the method is improved in 4.5 × 10−10 M. The suitability of the proposed method for determination of
trace bismuth in real sample was established by the analysis of a metallic aluminum sample.
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