期刊论文

中文

化学试剂

0258-3283

2008

30

6

429-430,433

10.3969/j.issn.0258-3283.2008.06.009

衡阳师范学院科研启动基金（2006B32）资助.

本校为第一机构

用阳极溶出伏安法考察了Nafion/多壁碳纳米管(MWCNT)复合修饰玻碳电极测量痕量镉的优化条件。在pH5.8的磷酸盐缓冲液中,当Cd~(2+)在Nafion/MWCNT修饰电极表面富集时间为3min,电位扫速为150mV/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-0.78V。利用该峰可以进行痕量镉的检测,峰电流与Cd~(2+)浓度在8.0×10~(-10)～1.0×10~(-8)mol/L的范围内呈良好线性关系,相关系数为0.999,检出限可达1.0×10~(-11)mol/L(S/N=3)。该法用于人发样品中镉含量的测定,平均回收率为98.7%。

A new method for determination of trace cadmium with a Nafion/MWCNT modified glassy carbon electrode was reported in this paper.Optimum conditions of determining trace cadmium by using a modified electrode and the electrochemistry stability of the modified electrode were investigated by anodic stripping voltammetry.The result indicated that a sensitive oxidation peak was observed and the peak potential of anode was -0.78 V in phosphate buffer with a pH value of 5.8,provided that the accumulation time was 3 min and potential scan rate was 150 mV...