Citation: Li Jun LI, Hao CHENG, Wen Yi HUANG, Hong Xing KONG, Jian Ling WU, Jian Ping LU, Wei GAO, Jun Feng SONG. The Determination of Iodide Based on a Flow-injection Coupling Irreversible Biamperometry[J]. Chinese Chemical Letters, ;2005, 16(12): 1629-1632. shu

The Determination of Iodide Based on a Flow-injection Coupling Irreversible Biamperometry

1.
Department of Biological and Chemical Engineering, Guangxi University of Technology, Liuzhou 545006;
2.
College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004;
3.
Institute of Analytical Science, Northwest University, Xi'an 710069

Received Date: 26 May 2005

Fund Project: Thanks for the financial support of the Guangxi Science Fund For Youth (No.0135003) and Guangxi Universities One Hundred Young-middle Scholar Fund for the present work.

A novel flow-injection irreversible biamperometric method is described for the direct determination of iodide. The method is based on electrochemical oxidation of iodide at the gold electrode and the reduction of permanganate at the platinum electrode to form an irreversible biamperometric detection system. Under the applied potential difference of 0 V, in the 0.05mol/L sulfuric acid, iodide can be determined over the range 4.00×10^-7-1.00×10^-5 mol/L with a sampling frequency of 120 samples per hour. The detection limit for Ⅰ^- is 3.0×10^-7 mol/L and the RSD for 40 replicate determinations of 4.0×10^-5 mol/L potassium iodide is 1.68%. The new method was applied to the analysis of iodide in table salt with satisfactory results.
- Iodide,
- flow injection,
- irreversible biamperometry,
- gold electrode,
- platinum electrode
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