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| Titel: |
Determination of ultratrace lead with bismuth film electrodes based on magneto-voltammetry |
| Auteur: |
Gao, Yanping Wei, Wanzhi Gao, Xiaohua Zeng, Jinxiang Yin, Jian |
| Verschenen in: |
International journal of environmental analytical chemistry |
| Paginering: | Jaargang 87 (2007) nr. 7 pagina's 521-533 |
| Jaar: |
2007-06 |
| Inhoud: |
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. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 12 van 28 gevonden artikelen
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