Publication: Flow-injection determination of iodide ion in nuclear emergency tablets, using boron-doped diamond thin film electrode
Issued Date
2004-12-15
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ISSN
00399140
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2-s2.0-7044229330
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Mahidol University
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SCOPUS
Bibliographic Citation
Talanta. Vol.64, No.5 SPEC. ISS. (2004), 1253-1258
Suggested Citation
O. Chailapakul, M. Amatatongchai, P. Wilairat, K. Grudpan, D. Nacapricha Flow-injection determination of iodide ion in nuclear emergency tablets, using boron-doped diamond thin film electrode. Talanta. Vol.64, No.5 SPEC. ISS. (2004), 1253-1258. doi:10.1016/j.talanta.2004.04.023 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/21261
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Title
Flow-injection determination of iodide ion in nuclear emergency tablets, using boron-doped diamond thin film electrode
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Abstract
The electrochemical determination of iodide was studied at boron-doped diamond thin film electrodes (BDD) using cyclic voltammetry (CV) and flow-injection (FI) analysis, with amperometric detection. Cyclic voltammetry of iodide was conducted in a phosphate buffer pH 5. Experiments were performed using glassy carbon (GC) electrode as a comparison. Well-defined oxidation waves of the quasi-reversible cyclic voltammograms were observed at both electrodes. Voltammetric signal-to-background ratios (S/B) were comparable. However, the GC electrode gives much greater in the background current as usual. The potential sweep rate dependence exhibited that the peak current of iodide oxidation at 1 mM varied linearly (r2= 0.998) with the square root of the scan rate, from 0.01 to 0.30 V s-1. This result indicates that the reaction is a diffusion-controlled process with negligible adsorption on BDD surface, at this iodide concentration. Results of the flow-injection analysis show a highly reproducible amperometric response. The linear working range was observed up to 200 μM (r2= 0.999). The detection limit, as low as 0.01 μM (3σ of blank), was obtained. This method was successfully applied for quantification of iodide contents in nuclear emergency tablets. © 2004 Elsevier B.V. All rights reserved.