Preparation of bismuth film-modified gold electrodes for the determination of trace level of heavy metals in vegetables

Xiaoyan Du, Weilei Gong, Yuxue Zhang, Maoqing Wang, Shuran Wang, Jun Ichi Anzai

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Bismuth film-modified gold (Au) electrodes were prepared by an ex-situ and in-situ plating for the simultaneous determination of a trace level of lead (Pb2+) and cadmium (Cd2+) ions by anodic stripping voltammetry. The effects of several key operational parameters in the electrochemical deposition of Bi3+ ion on a Au substrate, such as the concentration and deposition time of Bi3+ ion, preconcentration time, pH of supporting electrolyte, and the stripping potential scan mode, were optimized. Pb2+ and Cd2+ ions formed alloys with bismuth and displayed well-defined peaks in differential pulse stripping voltammetry. Following a 180 s preconcentration, the calibration graphs were linear over the 5-300 and 10-160 μg/L ranges of the ions for ex-situ and in-situ Bi filmmodified electrodes (BiFE), respectively, and the lower detection limits were down to μg/L level. The modified electrodes were applied to the determination of Pb2+ ion in vegetables.

Original languageEnglish
Pages (from-to)572-577
Number of pages6
JournalSensor Letters
Volume5
Issue number3-4
DOIs
Publication statusPublished - 2007 Sep 1

Keywords

  • Anodic stripping voltammetry
  • Bismuth film electrodes
  • Gold electrode
  • Heavy metals

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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