Development of amperometric arsine gas sensor using gold-modified diamond electrodes

Tribidasari A. Ivandini, Daisuke Yamada, Takeshi Watanabe, Hiroaki Matsuura, Nabuo Nakano, Akira Fujishima, Yasuaki Einaga

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Amperometric gas sensor of arsine was developed using gold-modified diamond electrodes as the working electrodes. The detection method was conducted in high concentration of H2SO4. The reaction was declared based on two oxidation steps, involving oxidation of As3- to As 0 at mild potential in strong acid, followed by electrochemical oxidation of As0 to As3+ at gold-based electrodes. Linear calibration curve was observed in the concentration range of 5-50 ppb (r 2 = 0.985) with detection limit of ∼4.43 ppb (S/N = 3). Current decreasing of measurement was found ∼5.5% for 5 measurements. However, better stability was observed after the 5th measurement, indicated that the sensor could be applied for long time measurement. Investigation to several possible interference gasses, i.e. SO2, H2S, NO, NO 2, CO, O3 and H2 indicated no significant interference of the gas to arsine measurements.

Original languageEnglish
Pages (from-to)58-63
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume645
Issue number1
DOIs
Publication statusPublished - 2010 Jun 15

Keywords

  • Amperometric detection
  • Arsine
  • Diamond electrodes
  • Electrochemical analysis
  • Gas sensor
  • Gold-modified

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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