Journal
ANALYTICA CHIMICA ACTA
Volume 437, Issue 2, Pages 217-224Publisher
ELSEVIER
DOI: 10.1016/S0003-2670(01)00973-4
Keywords
anodic stripping voltammetry; solid phase extraction; Bi(III) oxinate; chloroform; aluminum
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The voltammetric characteristics of BL(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 x 10(-8) to 5 x 10(-6),d 3.5 x 10(-9) M 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 x 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. (C) 2001 Elsevier Science B.V. All rights reserved.
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