中文摘要：

多墙碳 nanotubes (MWCNT ) 和合成电影(MWCNTs/Nafion ) 被用于在几为踪迹铅(II ) 和镉(II ) 的 voltammetric 察觉制作电气化学的传感器的 Nafion 浇样品。MWCNTs/Nafion 电影的形态学和结构被扫描电子显微镜学(SEM ) 和红外线的光谱(红外) 描绘。MWCNTs/Nafion 合成电影的电子转移被周期的 voltammetry (CV ) 和电气化学的阻抗光谱(EIS ) 检验。各种各样的试验性的参数，影响了 MWCNTs/Nafion/GC 的反应指向金属，被优化。结果证明 synergistic 效果在其敏感和稳定性比 Nafion 涂的电极(Nafion/GC ) 或 CNTs/GC 的那些好的 MWCNTs/Nafion/GC 上被获得。Pb (II ) 和剥去信号的 Cd (II ) 的稳定性与亲戚是优秀的从一电极准备的在 5% 以内的标准差(RSD )(n=10 ) 到另外一个，和 30 g 的 RSD

英文摘要：

Multi-wall carbon nanotubes （MWCNTs） and Nation composite film （MWCNTs/Nafion） were used for fabricating electrochemical sensors for the voltammetric detection of trace lead（Ⅱ） and cadmium（Ⅱ） in several water samples. The morphology and structure of MWCNTsfNafion film were characterized by scanning electron microscopy （SEM） and infrared spectrum （IR）. The electron transfer of MWCNTs/Nafion composite film was examined by cyclic voltammetry （CV） and electrochemical impedance spectrum （EIS）. Various experimental parameters, which influenced the response of MWCNTs/Nation/GC to target metals, were optimized. The results showed that the synergistic effect was obtained on the MWCNTs/Nafion/GC whose sensitivity and stability were better than those of Nation-coated electrode （Nafion]GC） or CNTs/GC. Stability of the Pb（II） and Cd（Ⅱ） stripping signals was excellent with relative standard deviations （RSD） within 5% （n = 10） from one electrode preparation to another, and RSD of 30μg.L^1 Pb（Ⅱ） and Cd（Ⅱ） were 2.8% and 3.2% for 20 repeated analysis on one single CNTs/Nafion/GC. Over 50 runs, the stability of Pb and Cd detection at the MWCNTs/Nafion conposites electrode was still satisfactory with RSD lower than 6.0%. The determination limits （S/N=3） of the proposed method were determined to be 100 ng·L^-1 for Pb and 150 ng.L^-1 for Cd. Finally, the MWCNTs/Nafion/GC was successfully applied to determine Pb（Ⅱ） and Cd（Ⅱ） in different water samples with recoveries of 97%-103% for Pb and 96%-104% for Cd.