Method development for the determination of arsenic by sequential injection/anodic stripping voltammetry using long-lasting gold-modified screen-printed carbon electrode

Eakkasit Punrat, Suchada Chuanuwatanakul, Takashi Kaneta, Shoji Motomizu, Orawon Chailapakul

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

An automated method has been developed for determining the concentration of inorganic arsenic. The technique uses sequential injection/anodic stripping voltammetry with a long-lasting gold-modified screen-printed carbon electrode. The long-lasting gold electrode was electrochemically deposited onto a screen-printed carbon electrode at a potential of -0.5 V vs. Ag/AgCl in a supporting electrolyte solution of 1 M hydrochloric acid. Under optimal conditions and the applied potentials, the electrode demonstrated that it can be used for a long time without a renewal process. The linear range for the determination of arsenic(III) was 1-100 μg L-1, and the limit of detection (LOD) in standard solutions was as low as 0.03 μg L-1 for a deposition time of 120 s and sample volume of 1 mL. This method was used to determine the concentration of arsenic(III) in water samples with satisfactory results. The LOD in real samples was found to be 0.5 μg L -1. In addition, speciation between arsenic(III) and arsenic(V) has been achieved with the proposed method using deposition potentials of -0.5 V and -1.5 V for the determination of the arsenic(III) concentration and the total arsenic concentration, respectively; the results were acceptable. The proposed method is an automated system that offers a less expensive alternative for determining trace amounts of inorganic arsenic.

Original languageEnglish
Pages (from-to)1018-1025
Number of pages8
JournalTalanta
Volume116
DOIs
Publication statusPublished - 2013

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Arsenic
Voltammetry
Gold
Electrodes
Carbon
Injections
Limit of Detection
Hydrochloric Acid
Electrolytes
Water

Keywords

  • Anodic stripping voltammetry
  • Arsenic determination
  • Long-lasting electrode
  • Screen-printed carbon electrode
  • Sequential injection analysis

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Method development for the determination of arsenic by sequential injection/anodic stripping voltammetry using long-lasting gold-modified screen-printed carbon electrode. / Punrat, Eakkasit; Chuanuwatanakul, Suchada; Kaneta, Takashi; Motomizu, Shoji; Chailapakul, Orawon.

In: Talanta, Vol. 116, 2013, p. 1018-1025.

Research output: Contribution to journalArticle

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AU - Motomizu, Shoji

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