摘要
研究了利用Nation／多壁碳纳米管（MWCNT）复合修饰玻碳电极测定痕量锡的阳极溶出伏安法。结果表明，在pH值为1.2的NH4C1-HCl电解液中，当Sn（Ⅳ）在Nafion／MwCNT复合修饰电极表面富集时间为3min，电位扫描速度为200mV／S时，该修饰电极在伏安图上能出现一灵敏的氧化峰，峰电位约为-570mV，利用该峰可以进行痕量锡的检测；峰电流与Sn（Ⅳ）浓度在4.0×10^-8～1.0×10^-6mol／L的范围内呈良好线性关系，相关系数为0.997，检出限为1.0×10^-8mol／L；该修饰电极稳定性较好，用于实际水样中锡含量的测定，平均回收率为97.48％，所得结果令人满意。
Optimum conditions of determining trace tin by anodic stripping voltammetry were investigated by using a Nafion/ MWCNT modified glassy carbon electrode. The result indicated a sensitive oxidation peak was observed and the peak potential of anode was-570 mV in NH4C1-HC1 electrolyte with pH being 1.2. provided accumulation time was 3 min and potential scan rate was 200 mV/s. The trace tin was determined by using this peak. There was a good liner relationship between the peak current and Sn（ Ⅳ ） concentration in the range of 4.0×10^-8-1.0×10^-6mol/L with correlation coefficient of 0. 997, and the detection limit was 1.0 ×10^-8 mol/L. This propose method had been applied to the determination of actual water sample and the average recovery was 97.48%. The result was satisfying.
出处
《衡阳师范学院学报》
2007年第6期96-98,共3页
Journal of Hengyang Normal University
基金
衡阳师范学院科研启动基金资助(2006B32)
湖南省有机化学重点建设学科资助
关键词
碳纳米管
玻碳电极
阳极溶出法
锡
carbon nanot ubes
glassy carbon electrode
anodic stripping voltammetry
tin
