期刊论文

Li, J.-H.(junhua325@yahoo.com.cn)

中文

冶金分析

1000-7571

2008

28

11

7-11

10.3969/j.issn.1000-7571.2008.11.002

本校为第一且通讯机构

基于羧基化多壁碳纳米管(c-MWCNT)修饰碳糊电极为工作电极,建立了无汞和高灵敏测定痕量锌的新方法。在0.1 mol/L KCl电解液(pH 6.7)中,当Zn~(2+)在羧基化多壁碳纳米管修饰碳糊电极表面富集100 s,电位扫速为300 mV/s时,该修饰电极在阳极溶出伏安图上能出现一灵敏的溶出峰,峰电位约为-0.98 V,利用该峰可以进行痕量锌的检测。峰电流与Zn~(2+)浓度在1.0×10~(-11)～1.0×10~(-9)mol/L和1.5×10~(-9)～3.0×10~(-8)mol/L的范围内成良好线性关系,其相关系数均为0.997,检出限可达1.0×10~(-13)mol/L。修饰电极稳定性较好,用于管网水样中锌含量的测定,回收率在97.7%~102.6%。同时循环伏安(CV)和交流阻抗...

A highly-sensitive and mercury-free method of determining trace zinc was established based on carboxylated carbon nanotubes modified carbon paste electrode. In 0.1 mol/L KC1 solution (pH 6.7), there was a sensitive anodic stripping peak on voltammograms and the stripping peak potential was -0.98 V when accumulation time of Zn2+ at the modified electrode was 100 s and potential scan rate was 300 mV/s. Trace zinc could be determined by this peak. There was a good liner relationship between the peak current and Zn2+ concentration in the range of 1.0×10-11-1.0×10-9 mol/L and 1.5×...