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Citation: DENG Pei-Hong, FEI Jun-Jie, KUANG Yun-Fei. Determination of Iodine with Multi-Walled Carbon Nanotubes Modified Acetylene Black Electrode[J]. Chinese Journal of Applied Chemistry, ;2009, 26(7): 875-877. shu

Determination of Iodine with Multi-Walled Carbon Nanotubes Modified Acetylene Black Electrode

1.
a Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008;
2.
b College of Chemistry, Xiangtan University, Xiangtan

Corresponding author: DENG Pei-Hong,
Received Date: 11 July 2008
Available Online: 10 October 2008
Fund Project: 衡阳市科学技术局(2007KJ001) (2007KJ001)衡阳师范学院科学基金(07A19)资助项目 (07A19)

A multi-wall carbon nanotubes modified acetylene black electrode was prepared and the voltamme-tric characteristics of iodine ions on the modified electrode was studied.The effects of the type and acidity of electrolytes on the oxidation peak current of iodine ions were also studied to acquire optimum conditions.In 0.4 mol/L KH₂PO₄ solution(pH=4.0),when scanning linearly from 200 mV to 1 200 mV at a scan rate of 200 mV/s,a sensitive oxidation peak appeared at 570 mV(vs.SCE).The peak current of the modified electrode raised around three fold than that of the unmodified electrode.By means of the second derivative linear sweep technique,good linearity was obtained between the oxidation peak current and the concentration of iodine ions in a range of 2.0×10^-6～1.0×10^-3 mol/L,and the detection limit reached 8.0×10^-7 mol/L.This method was successfully applied to the determination of iodine in edible salt.The relative standard deviation was between 1.2%~1.6%,and the relative error was between 97.4%~103%.
- chemical modified electrode,
- multi-wall carbon nanotubes,
- iodine ion,
- voltammetry
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