A simple, cost-effective sensor for detecting lead ions inwater using under-potential deposited bismuth sub-layer with differential pulse voltammetry (DPV)

Yifan Dai, Chung Chiun Liu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

This research has developed a simple to use, cost effective sensor system for the detection of lead ions in tap water. An under-potential deposited bismuth sub-layer on a thin gold film based electrochemical sensor was designed, manufactured, and evaluated. Differential pulse voltammetry (DPV) measurement technique was employed in this detection. Tap water from the Cleveland, OH, USA regional water district was the test medium. Concentrations of lead ion in the range of 8 × 10-7 M to 5 × 10-4 M were evaluated, showing a good sensitivity over this concentration range. The calibration curve for the DPV measurements of lead ions in tap water showed excellent reproducibility with R2 value of 0.970. This DPV detection system required 3–6 min to complete the detection measurement. A longer measurement time of 6 min was used for the lower lead ion concentration. The selectivity of this lead ion sensor was very good, and Fe III, Cu II, Ni II, and Mg II at a concentration level of 5 × 10-4 M did not interfere with the lead ion measurement.

Original languageEnglish
Article number950
JournalSensors (Switzerland)
Volume17
Issue number5
DOIs
StatePublished - May 2017

Keywords

  • Bismuth sub-layer
  • DPV
  • Lead ions
  • Under-potential deposition

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