Abstract
Nitrophenol (NP) isomers are toxic for human, animals and plants. Therefore determination of them in environment is very urgent and important. In this paper, cyclic voltammetry was applied to polymerization of diphenylamine (DPA) onto the multi-walled carbon nanotubes-β-cyclodextrin (MWCNT-β-CD) modified GCE in monomer solution and 5 M H2SO4 and then NP isomers were determined using modified electrode. After adsorption of NP isomers on PDPA/MWCNT-β-CD at 0.2 V for 150 s, it showed two reduction peaks in phosphate buffer solution at pH 7. 4-nitrophenol (4-NP) peak was shown as an individual peak but the peaks of 2-nitrophenol (2-NP) and 3-nitrophenol (3-NP) overlapped with each other. Therefore adaptive neuro-fuzzy inference system (ANFIS) was applied for the simultaneous analysis of the voltammogram data. The detection limits for 2-NP, 3-NP and 4-NP were obtained as 5.0 × 10–7, 1.1 × 10–7 and 1.3 × 10–7 M, respectively. These results showed that modified electrode has well sensitivity and selectivity for simultaneous determination of NP isomers. This sensor was applied for determination of NP isomers in water samples analysis. This is the first application of this sensor and ANFIS method for simultaneous determination of NP isomers. The reduction mechanism was also investigated.
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