Abstract
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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
