title: Differential pulse voltammetric determination of methyl parathion based on multiwalled carbon nanotubes-poly(acrylamide) nanocomposite film modified electrode.
abstract: A sensitive electrochemical differential pulse voltammetry method was developed for detecting methyl parathion based on multiwalled carbon nanotubes-poly(acrylamide) (MWCNTs-PAAM) nanocomposite film modified glassy carbon electrode. The novel MWCNTs-PAAM nanocomposite, containing high content of amide groups, was synthesized by PAAM polymerizing at the vinyl group functionalized MWCNTs surface using free radical polymerization. The MWCNTs-PAAM nanocomposite was characterized by Fourier transform infrared spectroscopy, thermal gravimetric analysis and scanning electron microscopy. Electrochemical behavior and interference studies of MWCNTs-PAAM/GCE for methyl parathion were investigated. The experimental results demonstrated that the MWCNTs-PAAM/GCE exhibited a high adsorption and strong affinity toward methyl parathion compared with some metal ions and nitroaromatic compounds, which exist in environmental samples. The adsorbed amount of methyl parathion on the MWCNTs-PAAM/GCE approached the equilibrium value upon 5 min adsorption time. A linear calibration curve for methyl parathion was obtained in the concentration range from 5.0×10(-9) to 1.0×10(-5) mol L(-1), with a detection limit of 2.0×10(-9) mol L(-1). The MWCNTs-PAAM/GCE was proved to be a suitable sensing tool for the fast, sensitive and selective determination of methyl parathion in environmental water samples.
authors.affiliation: Department of Chemistry and Shanghai Key Laboratory of Green Chemistry and Chemical Process, East China Normal University, Shanghai, PR China.
authors.forename: Yanbo
authors.initials: Y
authors.lastname: Zeng
authors.forename: Dajun
authors.initials: D
authors.lastname: Yu
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Yu
authors.forename: Tianshu
authors.initials: T
authors.lastname: Zhou
authors.forename: Guoyue
authors.initials: G
authors.lastname: Shi
mesh_terms: D055664:Electrochemical Techniques; D004566:Electrodes; D008743:Methyl Parathion / Q000032:analysis*; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D037742:Nanotubes, Carbon; D008743:Methyl Parathion