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Citation: WANG Xiao-Gang, WU Qing-Sheng, FAN Ya-Juan. Electrochemical Analysis of Dinitrophenol Isomers Using Carbon Nanotube Modified Electrode[J]. Chinese Journal of Applied Chemistry, ;2008, 25(6): 642-646. shu

Electrochemical Analysis of Dinitrophenol Isomers Using Carbon Nanotube Modified Electrode

1.
Department of Chemistry, Tongji University, Shanghai 200092

Corresponding author: WANG Xiao-Gang,
Received Date: 6 July 2007
Available Online: 10 November 2007
Fund Project: 国家自然科学基金(20471042) (20471042)教育部博士点基金(20040247045)资助项目 (20040247045)

In a 0.1 mol/L NaAc-HAc buffer solution (pH=5.0),the electrochemical behavior of 2,4-and 2,5-dinitrophenol was investigated at the glassy carbon electrode modified with multi walled carbon nanotube.Each of them exhibited sensitive reduction responses of nitryls.It was found that the reduction peak of nitryl of the position 4-nitrate group of 2,4-dinitrophenol showed great difference from that of the position 5-nitrate group of 2,5-dinitrophenol.The difference between the two reduction potentials was as large as 180 mV.By measuring the reduction signals of a mixed sample with linear sweep voltammetry,and improving the resolution by taking semi-derivatives,dinitrophenol isomers were determined simultaneously and quantitatively.The linear calibration ranges were 1.0×10^-6~5.0×10^-4 mol/L for both 2,4-and 2,5-dinitrophenol,with detection limits of 2.1×10^-7 mol/L for 2,4- and 1.1×10^-7 mol/L for 2,5-dinitrophenol,respectively.This method was applied to the detection of dinitrophenols in artificial wastewater,and the recovery was from 97.6% to 103.3%.
- carbon nanotube,
- modified electrode,
- derivative voltammetry,
- dinitrophenol,
- determination
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