Gold nanoparticle modified screen-printed carbon arrays for the simultaneous electrochemical analysis of lead and copper in water

Prosper Kanyong, Sean Rawlinson, James Davis

Research output: Contribution to journalArticle

22 Citations (Scopus)
15 Downloads (Pure)

Abstract

The development of disposable screen-printed carbon arrays modified with gold nanoparticles (AuNPs) is described. The AuNP-modified screen-printed carbon arrays, designated as AuNP-SPCE arrays, were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The AuNP-SPCE display excellent electrocatalytic activity towards lead and copper. Two well-defined and fully resolved anodic stripping peaks, at 20 mV for Pb(II) and at 370 mV for Cu(II), both vs. Ag/AgCl, can be seen. Square wave anodic stripping voltammetry was used to simultaneously analyze Pb (II) and Cu(II) in their binary mixtures in tap water. The linear working range for Pb(II) extends from 10 μg.L-1 to 100 μg.L-1 with a sensitivity of 5.942 μA.μg-1.L.cm-2. The respective data for Cu(II) are a working range from 10 μg.L-1 to 150 μg.L-1 with a sensitivity of 3.52 μA.μg-1.L.cm-2. The limits of detection (based on 3x the baseline noise) are 2.1 ng.L-1 and 1.4 ng.L-1, respectively. In our perception, this array is particularly attractive because Pb(II) and Cu(II) can be determined at rather low working potentials which makes the method fairly selective in that it is not significantly interfered by other electroactive species that require higher reduction potentials.
Original languageEnglish
Pages (from-to)2361-2368
JournalMicrochimica Acta
Volume183
Issue number8
Early online date26 May 2016
DOIs
Publication statusPublished - Aug 2016

Keywords

  • Nanomaterial-based sensing
  • Screen-printed electrode
  • Heavy metal analysis
  • Disposable sensor
  • Hexacyanoferrate
  • Cyclic voltammetry
  • Square wave anodic stripping voltammetry
  • Electrochemical impedance spectroscopy
  • Electrode coverage
  • Dual sensing

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