A composite film modified glassy carbon electrode (GCE) fabricated with spinning coating of multiwalled carbon nano-tube (MWNT) /1-butyl-3-methylimidazolium tetrafluoroborate/chitosan sol was developed for the electrochemical determination of 4-nitrophenol (4-NP). An obvious reduction peak located at about −0.688 V was observed with voltammetric measurements in the potential range from 0.200 V to −1.00 V. Compared with the bare GCE, the reduction peak potential shifted positively and the peak current increased significantly. All experimental parameters for the determination of 4-NP were optimized. It was found that the reduction peak current was proportional to 4-NP concentration in the range from 3.00 × 10 −7 to 2.00 × 10 −5 mol l −1 with the detect limitation of 1.00 × 10 −7 mol l −1 (S/N = 3) after accumulation for 90 s. The proposed method was successfully applied for the determination of trace amounts of 4-NP in lake water.
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Chen et al. (2009) studied this question.
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