Journal of Solid State Electrochemistry

, Volume 15, Issue 9, pp 2023–2029 | Cite as

The effect of composition of solid silver amalgam electrodes on their electrochemical response

  • Djenaine De Souza
  • Lucia Helena Mascaro
  • Orlando Fatibello-Filho
Original Paper

Abstract

The main purpose of this work was to evaluate the effect of the silver to mercury ratio on the voltammetric responses of silver solid amalgam electrodes (AgSAE’s). For this, the AgSAE were prepared by mechanical mixing the metals in the following mass ratios of silver to mercury: 30/70, 40/60, 50/50, 60/40, and 70/30. The resulting AgSAE’s were physically characterized by energy dispersive X-ray analysis, X-ray diffraction and scanning electron microscopy, confirming the mass percentages of the silver and mercury, the total absence of liquid mercury and a globular structure of all AgSAE’s. Furthermore, it was observed that the AgSAE 30/70 contained only one single phase (Ag2Hg3), and no metallic silver or mercury oxides. Additionally, the resulting AgSAE’s were chemically characterized with respect to the influence of the electrode composition on the reproducibility and electrochemical signals of a hexamine-ruthenium (III) chloride solution by use of electrochemical impedance spectroscopy and cyclic voltammetry. The separation between anodic and cathodic peaks, and consequently, the charge transfer resistance across the electrode/solution interface, and the electroactive area were calculated demonstrating that the 30/70 composition is the best surface for practical applications. Finally, square-wave voltammetry experiments were performed in 4-nitrophenol solution, with a previous optimization of the experimental and voltammetric parameters. The calculated detection limit shows that the AgSAE 30/70 is suitable for determining any contamination by p-nitrophenol, minimizing the toxic residues in case of using liquid mercury electrodes.

Keywords

Silver solid amalgam electrode Amalgam electrode Mercury waste p-Nitrophenol Square-wave voltammetry 

Notes

Acknowledgments

The authors would like to thank the National Council for Research—CNPq (process 150610/2007-6) for financial support.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Djenaine De Souza
    • 1
  • Lucia Helena Mascaro
    • 2
  • Orlando Fatibello-Filho
    • 2
  1. 1.Departamento de Química Analítica e Físico-Química, Centro de CiênciasUniversidade Federal d’o CearáFortalezaBrazil
  2. 2.Departamento de QuímicaUniversidade Federal de São CarlosSão CarlosBrazil

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