Amperometric determination of sulfite by gas diffusion-sequential injection with boron-doped diamond electrode

Chakorn Chinvongamorn, Kulwadee Pinwattana, Narong Praphairaksit, Toshihiko Imato, Orawon Chailapakul

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A gas diffusion sequential injection system with amperometric detection using a boron-doped diamond electrode was developed for the determination of sulfite. A gas diffusion unit (GDU) was used to prevent interference from sample matrices for the electrochemical measurement. The sample was mixed with an acid solution to generate gaseous sulfur dioxide prior to its passage through the donor channel of the GDU. The sulfur dioxide diffused through the PTFE hydrophobic membrane into a carrier solution of 0.1 M phosphate buffer (pH 8)/0.1% sodium dodecyl sulfate in the acceptor channel of the GDU and turned to sulfite. Then the sulfite was carried to the electrochemical flow cell and detected directly by amperometry using the boron-doped diamond electrode at 0.95 V (versus Ag/AgCl). Sodium dodecyl sulfate was added to the carrier solution to prevent electrode fouling. This method was applicable in the concentration range of 0.2-20 mg SO3 2/L and a detection limit (S/N = 3) of 0.05 mg SO3 2-/L was achieved. This method was successfully applied to the determination of sulfite in wines and the analytical results agreed well with those obtained by iodimetric titration. The relative standard deviations for the analysis of sulfite in wines were in the range of 1.0-4.1 %. The sampling frequency was 65 h-1.

Original languageEnglish
Pages (from-to)1846-1857
Number of pages12
JournalSensors
Volume8
Issue number3
DOIs
Publication statusPublished - Mar 2008

Fingerprint

sulfites
Sulfites
Diamond
Boron
gaseous diffusion
Diffusion in gases
Diamonds
Electrodes
boron
Gases
diamonds
injection
Injections
Wine
electrodes
Sodium dodecyl sulfate
Sulfur dioxide
wines
Sulfur Dioxide
sulfur dioxides

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

Chinvongamorn, C., Pinwattana, K., Praphairaksit, N., Imato, T., & Chailapakul, O. (2008). Amperometric determination of sulfite by gas diffusion-sequential injection with boron-doped diamond electrode. Sensors, 8(3), 1846-1857. https://doi.org/10.3390/s8031846

Amperometric determination of sulfite by gas diffusion-sequential injection with boron-doped diamond electrode. / Chinvongamorn, Chakorn; Pinwattana, Kulwadee; Praphairaksit, Narong; Imato, Toshihiko; Chailapakul, Orawon.

In: Sensors, Vol. 8, No. 3, 03.2008, p. 1846-1857.

Research output: Contribution to journalArticle

Chinvongamorn, C, Pinwattana, K, Praphairaksit, N, Imato, T & Chailapakul, O 2008, 'Amperometric determination of sulfite by gas diffusion-sequential injection with boron-doped diamond electrode', Sensors, vol. 8, no. 3, pp. 1846-1857. https://doi.org/10.3390/s8031846
Chinvongamorn C, Pinwattana K, Praphairaksit N, Imato T, Chailapakul O. Amperometric determination of sulfite by gas diffusion-sequential injection with boron-doped diamond electrode. Sensors. 2008 Mar;8(3):1846-1857. https://doi.org/10.3390/s8031846
Chinvongamorn, Chakorn ; Pinwattana, Kulwadee ; Praphairaksit, Narong ; Imato, Toshihiko ; Chailapakul, Orawon. / Amperometric determination of sulfite by gas diffusion-sequential injection with boron-doped diamond electrode. In: Sensors. 2008 ; Vol. 8, No. 3. pp. 1846-1857.
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