Determination of ultratrace lead with bismuth film electrodes based on magneto-voltammetry

A novel method for the determination of Pb 2+ with bismuth film electrodes (BFEs) based on magneto-voltammetry was investigated. In the presence of a 0.6 T external magnetic field, square wave voltammetry of Pb 2+ was performed with BFEs. A high concentration of Fe 3+ was added to the analytes to ge...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2007-06, Vol.87 (7), p.521-533
Main Authors: Gao, Yanping, Wei, Wanzhi, Gao, Xiaohua, Zeng, Jinxiang, Yin, Jian
Format: Article
Language:English
Subjects:
Bismuth film electrodes
Lead
Magneto-voltammetry
Square wave voltammetry
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Summary:A novel method for the determination of Pb 2+ with bismuth film electrodes (BFEs) based on magneto-voltammetry was investigated. In the presence of a 0.6 T external magnetic field, square wave voltammetry of Pb 2+ was performed with BFEs. A high concentration of Fe 3+ was added to the analytes to generate a large cathodic current during the preconcentration step. A Lorentz force from the flux of net current through the magnetic field resulted in convection. Then, more Pb 2+ deposited onto the electrode and larger stripping peak currents were observed. BFEs that were prepared by simultaneously depositing the bismuth and Pb 2+ on an electrode offered a mercury-free environment for this determination. This method exhibits a high sensitivity of 4.61 µA µM −1 for Pb 2+ over the 1 × 10 −8 to 1 × 10 −6  M range. A detection limit as low as 8.5 × 10 −10  M was obtained with only 1-min preconcentration. The method was successfully applied to determine Pb 2+ in real water samples.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067310701218932