Arsenic (III) detection with underpotential deposition on gold

Yifei Zhang, Danlei Li, Richard G. Compton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We report a new, sensitive stripping voltammetric method for the detection of As(III) in aqueous solution using either a gold macroelectrode or a gold nanoparticle-modified glassy carbon electrode (GCE) based on the underpotential deposition (UPD) of As ad-atoms. The pre-concentration step deposits and accumulates As ad-atoms onto gold and is followed by a potential sweep to strip the ad-atoms with no interference from Cu(II) or Cl- at either electrode. Linear responses were found for the range 0.01 μM to 0.1 μM or 0.005 μM to 0.1 μM at gold macroelectrodes and gold nanoparticle-modified electrodes, respectively. The visually clearly discernable signals recorded at 0.005 μM (0.4 ppb) on gold nanoparticle-modified electrodes suggests that this method has practical value given the WHO limit of 0.13 μM (10 ppb) for drinking water.

Original languageEnglish
Article number116154
JournalJournal of Electroanalytical Chemistry
Volume909
DOIs
Publication statusPublished - 15 Mar 2022
Externally publishedYes

Keywords

  • Anodic stripping voltammetry
  • Arsenic
  • Electroanalysis
  • Gold nanoparticles
  • Underpotential deposition

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