Use of a grafted polymer electrode to study mercury ions by cyclic voltammetry

Use of a grafted polymer electrode to study mercury ions by cyclic voltammetry Oxidation–reduction of mercury ions in 0.1 M KCl was studied by cyclic voltammetry at a grafted polymer electrode (GPE) prepared from polystyrene grafted with acrylonitrile as monomer by use of gamma irradiation. The oxidation potential peaks of mercury at the GPE appear at +0.3 and +0.15 V versus Ag/AgCl as reference electrode; the reduction potential peak appears at 0.0 V. The redox current peaks of Hg(II) were enhanced approximately tenfold in comparison with those at a glassy carbon electrode. Hence, GPE can be used for voltammetric analysis of Hg(II). The redox current of Hg(II) using the GPE was strongly affected by concentration and scan rate. A linear (R 2 = 0.952) calibration plot was obtained up to 0.1 mM Hg(II), with a highly sensitive response. When chronocoulometry and chronoamperometry were used to study 3 mM Hg2+ in 0.1 M KCl, using the GPE as working electrode, the diffusion coefficient (D) was 2.2 × 10−7 cm2/s and the total charge transferred to the GPE as Hg ions was 15.4 μC/m2. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Use of a grafted polymer electrode to study mercury ions by cyclic voltammetry

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Publisher
Springer Netherlands
Copyright
Copyright © 2013 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-013-1282-1
Publisher site
See Article on Publisher Site

Abstract

Oxidation–reduction of mercury ions in 0.1 M KCl was studied by cyclic voltammetry at a grafted polymer electrode (GPE) prepared from polystyrene grafted with acrylonitrile as monomer by use of gamma irradiation. The oxidation potential peaks of mercury at the GPE appear at +0.3 and +0.15 V versus Ag/AgCl as reference electrode; the reduction potential peak appears at 0.0 V. The redox current peaks of Hg(II) were enhanced approximately tenfold in comparison with those at a glassy carbon electrode. Hence, GPE can be used for voltammetric analysis of Hg(II). The redox current of Hg(II) using the GPE was strongly affected by concentration and scan rate. A linear (R 2 = 0.952) calibration plot was obtained up to 0.1 mM Hg(II), with a highly sensitive response. When chronocoulometry and chronoamperometry were used to study 3 mM Hg2+ in 0.1 M KCl, using the GPE as working electrode, the diffusion coefficient (D) was 2.2 × 10−7 cm2/s and the total charge transferred to the GPE as Hg ions was 15.4 μC/m2.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jun 20, 2013

References

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