Journal
TALANTA
Volume 98, Issue -, Pages 152-156Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2012.06.063
Keywords
Anodic stripping voltammetry; Flow analysis; Graphite felt; Zinc; Trace analysis; Porous electrode
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Funding
- luliu Hatieganu University of Medicine and Pharmacy [POS-DRU 88/1.5/S/56949]
- Agence Universitaire de la Francophonie [CE/MC/288/10]
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A flow sensor for trace analysis of zinc, using graphite felt as working electrode is reported here. A flow cell, well-adapted to 3-D porous electrodes and capable to do both the preconcentration step at a cathodic potential and the stripping of the zinc was successfully developed. It was demonstrated that this cell allows to obtain better electrochemical signals for Zn2+ compared to a standard three-electrodes cell and that the percolation during accumulation increases the kinetics of electrodeposition. The influence on Zn2+ signal of the deposition potential, the time of deposition and the flow rate was studied. The resulting sensor shows a linear response towards Zn2+ with a linear range of 10(-6)-10(-4) M and a limit of detection of 5 x 10(-7) M for an analysis time of 5 min. The interferences study showed that the Cr3+, Pb2+, Cd2+ ions have a small effect on the Zn electrochemical signal, whereas Fe3+, Cu2+, Co2+ and Ni2+ ions strongly influence it. The electrode was tested on real samples (tap water spiked with Zn2+, food supplement) with a good recovery by applying the standard addition method. (C) 2012 Elsevier B.V. All rights reserved.
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