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Potentiometric Stripping Analysis at Bismuth‐Film Electrode
Author(s) -
Hocevar Samo B.,
Wang Joseph,
Deo Randhir P.,
Ogorevc Bozidar
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200201)14:2<112::aid-elan112>3.0.co;2-5
Subject(s) - potentiometric titration , stripping (fiber) , bismuth , electrode , materials science , analytical chemistry (journal) , chemistry , metallurgy , environmental chemistry , composite material
A bismuth‐film electrode (BiFE) operated in the constant‐current potentiometric stripping mode exhibits an attractive performance for trace heavy metal detection. The BiFEs are prepared in situ on a glassy‐carbon supporting electrode from the 0.1 M acetate buffer solution (pH 4.5) containing 500 μg/L of bismuth(III) together with target heavy metal ions. The constant‐current potentiometric stripping mode of such electrodes yields well‐defined, undistorted, reproducible and sharp stripping signals (RSD 1.5% for cadmium, 2.5% for lead) with good resolution for multiple heavy metal measurements (Zn, Cd, Pb). Along with an extremely low baseline, low limit of detection (0.2 and 0.8 μg/L for cadmium and lead, respectively), and short deposition times, these electrodes compare favorably with “toxic” mercury film electrodes. Several key parameters of the constant‐current potentiometric stripping mode were examined and optimized, including the stripping current, deposition potential, and deposition time. The constant‐current potentiometric stripping mode of BiFE compares favorably to their voltammetric stripping analogues. Additional insights are given into application of BiFEs for constant‐current potentiometric stripping analysis.