Adsorptive stripping voltammetric measurements of trace uranium at the bismuth film electrode

Lin Lin, Sompong Thongngamdee, Joseph Wang, Yuehe Lin, Omowunmi A. Sadik, Suw Young Ly

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

Bismuth-coated carbon-fiber electrodes have been successfully applied for adsorptive stripping voltammetric measurements of trace uranium in the presence of cupferron. The new protocol is based on the accumulation of the uranium-cupferron complex at a preplated bismuth film electrode held at -0.30 V (versus Ag/AgCl), followed by a negatively-sweeping square-wave voltammetric waveform. Factors influencing the stripping performance, including the film preparation, solution pH, cupferron concentration, adsorption potential and time have been optimized. The resulting performance compares well with that observed for analogous measurements at mercury film electrodes. A detection limit of 0.3 μg/L is obtained in connection to a 10 min adsorption time. The response is linear up to 50 μg/L and the relative standard deviation at 50 μg/L uranium is 3.8% (n = 15; 2 min adsorption). Potential interferences are examined. Applicability to seawater samples is demonstrated. The attractive behavior of the new 'mercury-free' uranium sensor holds great promise for on-site environmental and industrial monitoring of uranium.

Original languageEnglish (US)
Pages (from-to)9-13
Number of pages5
JournalAnalytica Chimica Acta
Volume535
Issue number1-2
DOIs
StatePublished - Apr 11 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Spectroscopy
  • Environmental Chemistry

Keywords

  • Adsorptive-cathodic stripping voltammetry
  • Bismuth film electrode
  • Cupferron
  • Uranium

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