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DOI: 10.1039/A804554B (Paper) Reference Section for: Analyst, 1998, 123, 2017-2019

Measurement of sulfite at oxide-coated copper electrodes

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M. Kiattipoomchai, M. Somasundrum, M. Tanticharoen and K. Kirtikara

Abstract

The amperometric determination of sulfite was performed using copper electrodes in alkaline media. A mechanism for the oxidation of sulfite at these electrodes is suggested, based on the formation of superficial CuO(.OH), which acted as an electron transfer mediator to the analyte. At 0.5 V versus SCE in 1 M NaOH, sulfite could be calibrated at a sensitivity of 0.2 A l mol–1 cm–2, with a response time for the steady state of 30 s. The limit of detection (three times the signal-to-noise ratio) was 2.5 × 10–6M and the response was linear up to 5 × 10–4M (r2 = 0.9996, n = 15). The standard deviation (n = 10) at 1× 10–5 and 1 × 10–4M was 3.27 × 10–7 A cm–2 (mean = 3.62 × 10–6 A cm–2) and 1.07 × 10–13 A cm–2 (mean = 2.25 × 10–5 A cm–2), respectively.

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