Carbon paste electrode modified with carbamoylphosphonic acid functionalized mesoporous silica: A new mercury-free sensor for uranium detection

Wassana Yantasee, Yuehe Lin, Glen E. Fryxell, Zheming Wang

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

This study reports a new approach for developing a uranium electrochemical sensor that is mercury-free, solid-state, and has less chance for ligand depletion than existing sensors. A carbon-paste electrode modified with carbamoylphosphonic acid self-assembled monolayer on mesoporous silica was developed for uranium detection based on an adsorptive square-wave stripping votammetry technique. Voltammetric responses for uranium detection are reported as a function of pH, preconcentration time, and aqueous phase uranium concentration. The uranium detection limit is 25 ppb after 5 minutes preconcentration and improved to 1 ppb after 20 minutes preconcentration. The relative standard deviations are normally less than 5%.

Original languageEnglish (US)
Pages (from-to)870-873
Number of pages4
JournalElectroanalysis
Volume16
Issue number10
DOIs
StatePublished - May 1 2004

Keywords

  • Mesoporous silica
  • Modified electrode
  • Sensor
  • Uranium

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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