Determination of ultratrace lead with bismuth film electrodes based on magneto-voltammetry |
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Authors: | Yanping Gao Xiaohua Gao Jinxiang Zeng Jian Yin |
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Institution: | 1. State Key Laboratory of Chemical, Biological Sensing Technologies?&2. Chemometrics, Hunan University , Changsha 410082, PR China |
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Abstract: | A novel method for the determination of Pb2+ 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 Pb2+ was performed with BFEs. A high concentration of Fe3+ 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 Pb2+ deposited onto the electrode and larger stripping peak currents were observed. BFEs that were prepared by simultaneously depositing the bismuth and Pb2+ on an electrode offered a mercury-free environment for this determination. This method exhibits a high sensitivity of 4.61?µA?µM?1 for Pb2+ 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 Pb2+ in real water samples. |
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Keywords: | Magneto-voltammetry Bismuth film electrodes Lead Square wave voltammetry |
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