Oxidation reaction of dissolved hydrogen sulfide using boron doped diamond

Yunita Triana, Mai Tomisaki, Yasuaki Einaga

Research output: Contribution to journalArticlepeer-review

Abstract

We studied an oxidation reaction of dissolved hydrogen sulfide using boron doped diamond (BDD) electrodes and 0.1 mol Lˉ1 KClO4 as an electrolyte. Oxidation of H2S and HSˉ started at potentials of +1.7 V and + 0.5 V (vs. Ag/AgCl), respectively. In order to study the oxidation behavior, the effects of pH and the scan rate were investigated. Moreover, as demonstrated by X-ray photoelectron spectroscopy, no sulfur fouling was detected on the BDD surface. A linear calibration curve was observed in the concentration range of 0.08–2.34 mg Lˉ1 (r2 = 0.99) with a detection limit of 0.82 μg Lˉ1 (S/N = 3). In addition, an interference test with CO2 was performed, which showed there was no significant interference to the sensor.

Original languageEnglish
Article number114411
JournalJournal of Electroanalytical Chemistry
Volume873
DOIs
Publication statusPublished - 2020 Sep 15

Keywords

  • Diamond electrodes
  • Electrochemical analysis
  • Gas sensor
  • Hydrogen sulfide

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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