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Citation: LI Jun-Hua, ZHANG Fu-Xing, WANG Jian-Qiu, ZENG Rong-Ying, DENG Pei-Hong, PENG Yun-Lin, CHEN Xiao-Dong. Voltammetric Determination of Trace Indium by Using Nano-TiO₂ Modified Carbon Paste Electrode[J]. Chinese Journal of Applied Chemistry, ;2008, 25(6): 718-721. shu

Voltammetric Determination of Trace Indium by Using Nano-TiO₂ Modified Carbon Paste Electrode

1.
a Department of Chemistry and Materials Science, Hengyang Normal College, Hengyang 421008;
2.
b Analytical and Testing Centre, Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou

Corresponding author: LI Jun-Hua,
Received Date: 15 July 2007
Available Online: 30 October 2007
Fund Project: 衡阳师范学院科研启动基金(2006B32)资助项目 (2006B32)

Nano-TiO₂ powder prepared by sol-gel method was used to modify carbon paste electrode successfully.Optimum conditions for detection of trace indium at the modified electrode and the electrochemistry stability of the modified electrode were investigated by simultaneous cyclic voltammetry.There was a sensitive oxidation peak in the voltammogram at -0.832 V characteristic of trace indium in HAc-NaAc buffer whose pH was 5.4 when the accumulation time was 200 s and the potential scan rate was 200 mV/s.There was a good liner relationship between the peak current and In³⁺ concentration in a range of 1.0×10^-11~1.0×10^-9 mol/L with a correlation coefficient of 0.995,and the detection limit was 0.125×10^-11 mol/L.This proposed method was applied to the analysis of actual water samples and the average recovery was 96.16%.The oxidation process of indium was controlled by both charge transfer and diffusion at the modified electrode.This oxidation process of indium was irreversible,and its average activation energy was 72.36 kJ/mol.
- carbon paste electrode,
- nano-TiO₂,
- simultaneous cyclic voltammetry,
- indium
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Voltammetric Determination of Trace Indium by Using Nano-TiO2 Modified Carbon Paste Electrode

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通讯作者: 陈斌, bchen63@163.com

Voltammetric Determination of Trace Indium by Using Nano-TiO₂ Modified Carbon Paste Electrode