Determination of sub-μgl-1 concentrations of copper by anodic stripping voltammetry at the gold electrode

Y. Bonfil, M. Brand, E. Kirowa-Eisner

Research output: Contribution to journalArticlepeer-review

Abstract

A rotating disc gold electrode is used for the determination of copper in μgl-1 and sub-μgl-1 concentrations without removal of oxygen by the method of subtractive anodic stripping voltammetry (SASV). The detection limit for a 90s electrodeposition is 0.2nM.The reduction and stripping of copper on gold under the SASV conditions are underpotential deposition/dissolution phenomena. A uniformly distributed submonolayer of copper, occupying 0.01-5% of the real surface of the electrode, is formed. Linearity in calibration plot is obtained up to 5% electrode coverage; in terms of the experimental parameters of the deposition step (rate of rotation and time of electrolysis), this condition for linearity is C(Cu2+)N(1/2)t(d)≤7x105nMrpm(1/2)s.The bulk and underpotential deposition of Cu2+ have been characterized in the supporting electrolyte used (10mM HNO3 and 10mM NaCl).The analysis of copper in drinking and in sea waters has been performed. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)85-95
Number of pages11
JournalAnalytica Chimica Acta
Volume387
Issue number1
DOIs
StatePublished - 16 Apr 1999

Keywords

  • Anodic stripping voltammetry
  • Copper
  • Gold electrode
  • Trace analysis
  • Underpotential deposition

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