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Citation: DENG Pei-Hong, ZHANG Jun, FEI Jun-Jie, LI Ju-Nan. Determination of Trace Scandium by Adsorption Voltammetry at Multi-walled Carbon Nanotube Modified Carbon Paste Electrode[J]. Chinese Journal of Applied Chemistry, ;2009, 26(1): 94-99. shu

Determination of Trace Scandium by Adsorption Voltammetry at Multi-walled Carbon Nanotube Modified Carbon Paste 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: 27 December 2007
Available Online: 25 April 2008
Fund Project: 衡阳市科学技术局科技项目(2007KJ001) (2007KJ001)衡阳师范学院科学基金青年项目(07A19) (07A19)

A new method for the determination of ultra trace amounts of scandium is described.A multi-walled carbon nanotube modified carbon paste electrode was prepared and the adsorption voltammetric behavior of scandium-alizarin red S(ARS) complex at the modified electrode was investigated.By use of the second derivative linear sweep technique,it was found that in 0.32 mol/L acetic acid and 0.064 mol/L potassium biphthalate buffer solution(pH=4.0),the complex could be adsorbed on the surface of the electrode after accumulating at 100 mV for 90 s,yielding one sensitive stripping peak at-518 mV(vs.SCE) when scanning linearly from 0 mV to-1 000 mV at a scan rate of 200 mV/s,corresponding to the reduction of ARS in the complex.The peak current of the complex was linearly proportional to Sc(Ⅲ) concentration in a range of 4.0×10^-11～6.0×10^-7 mol/L and the detection limit(S/N=3) was 2.0×10^-11 mol/L for 3 min accumulation.The developed method was applied to the determination of trace scandium in the ore samples and the results were satisfactory.
- multi-walled carbon nanotube,
- chemically modified electrode,
- adsorption voltammetry,
- scandium
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