Sensitive Voltammetric Detection of Trace Heavy Metals in Real Water Using Multi‐Wall Carbon Nanotubes/Nafion Composite Film Electrode
作者： He Xu , Qiaoli Zheng , Ping Yang , Jianshe Liu , Litong Jin
关键词: Scanning electron microscope 、 Anodic stripping voltammetry 、 Nafion 、 Electrode 、 Carbon nanotube 、 Stripping (chemistry) 、 Analytical chemistry 、 Electrochemistry 、 Chemistry 、 Cyclic voltammetry
摘要: Multi-wall carbon nanotubes (MWCNTs) and Nafion composite film (MWCNTs/Nafion) were used for fabricating electrochemical sensors the voltammetric detection of trace lead(II) cadmium(II) in several water samples. The morphology structure MWCNTs/Nafion characterized by scanning electron microscopy (SEM) infrared spectrum (IR). transfer was examined cyclic voltammetry (CV) impedance (EIS). Various experimental parameters, which influenced response MWCNTs/Nafion/GC to target metals, optimized. results showed that synergistic effect obtained on whose sensitivity stability better than those Nafion-coated electrode (Nafion/GC) or CNTs/GC. Stability Pb(II) Cd(II) stripping signals excellent with relative standard deviations (RSD) within 5% (n=10) from one preparation another, RSD 30 µg·L−1 2.8% 3.2% 20 repeated analysis single CNTs/Nafion/GC. Over 50 runs, Pb Cd at conposites still satisfactory lower 6.0%. determination limits (S/N=3) proposed method determined be 100 ng·L−1 150 Cd. Finally, successfully applied determine different samples recoveries 97%–103% 96%–104%
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