Anodic stripping voltammetry at a new type of disposable bismuth-plated carbon paste mini-electrodes

被引:73
作者
Baldrianova, L.
Svancara, I.
Sotiropoulos, S. [1 ]
机构
[1] Univ Pardubice, Fac Chem Technol, Dept Analyt Chem, CZ-53210 Pardubice, Czech Republic
[2] Aristotle Univ Thessaloniki, Dept Chem, Thessaloniki 54124, Greece
关键词
bismuth film electrodes; microelectrodes; carbon paste electrodes; anodic stripping voltammetry;
D O I
10.1016/j.aca.2007.07.067
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A new type of disposable carbon paste mini-electrodes (CPmEs), with dimensions in the 50-300 mu m range, have been fabricated by heat-shrinking the end-tip of plastic micropipette tips and filling them with carbon paste. The CPmEs have been characterized by microscopic and electrochemical means and tested as substrates for in situ plated Bi film electrodes (BiF-CPmEs), used in the determination of heavy metals by square wave anodic stripping voltammetry (SWASV). It was found that this new class of CPmEs combines the advantages of carbon paste electrodes (readily renewable surface and high surface area) with those of near-microelectrode behaviour (no stirring or electrolyte excess needed). During SWASV experiments in unstirred Pb(II) and Cd(II) solutions well-shaped stripping peaks were obtained whose height varied linearly with analyte concentration in the wide 1 x 10(-8) to 10(-6) M range, both in acetate buffer and unbuffered solutions. Under optimal conditions detection limits of 8 x 10(-10) and 1.3 x 10(-9) M were achieved for Pb(II) and Cd(II), respectively and in a trial application, these metal ions have been determined in a spiked tap water sample using a BiF-CPmE. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:249 / 255
页数:7
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