Determination of mercury by intermittent flow electrochemical cold vapor generation coupled to atomic fluorescence spectrometry
- 作者：Xun Li ; Zhenghao Wang
- 关键词：Electrochemical cold vapor generation ; Atomic fluorescence spectrometry ; Intermittent flow ; Mercury
- 刊名：Analytica Chimica Acta
- 出版年：2007
- 期刊代码：2_00032670
- 类别：ch
- 出版时间：11 April 2007
- 卷：588
- 期：2
- 页码：179-183
- 文件大小：255 K
摘要
A novel method for determination of mercury was developed using an intermittent flow electrochemical cold vapor generation coupled to atomic fluorescence spectrometry (IF-ECVG-AFS). The mercury vapor was generated on the surface of glassy carbon cathode in the flow cell. The operating conditions for the electrochemical generation of mercury vapor were investigated in detail, and the interferences from various ions were evaluated. Under the optimized conditions, no evident memory effects of mercury were observed. The calibration curve was linear up to 5 μg L−1 Hg at 0.54 A cm−2. A detection limit of 1.2 ng L−1 Hg and a relative standard deviation of 1.8%for 1 μg L−1 Hg were obtained. The accuracy of method was verified by the determination of mercury in the certified reference human hair. The ECVG avoided the use of reductants, thereby greatly reducing the contamination sources. In addition, the manifold of IF-ECVG-AFS was simple and amenable to automation.