期刊论文

Deng, P.-H.

中文

冶金分析

1000-7571

2009

29

8

21-24

10.3969/j.issn.1000-7571.2009.08.005

07A19:衡阳师范学院科学基金青年项目 206104:教育部科学技术研究项目 05IND08:湘潭大学跨学科交叉研究基金项目

本校为第一且通讯机构

制备了多壁碳纳米管修饰乙炔炭黑微电极并研究了Sn(Ⅱ)在该电极上的阳极溶出伏安行为.实验发现,在1 mol/L HCl溶液中,Sn(Ⅱ)于-1 000 mV(vs.SCE)处被吸附还原,富集在该修饰电极表面.从-1 000 mV以100 mV/s的速率正向扫描至0 mV,锡在约-610 mV处出现一灵敏的阳极溶出峰,峰电流比未修饰电极增大约9倍.采用二阶导数线性扫描伏安法进行定量分析,峰电流与Sn(Ⅱ)的浓度在4.0×10~(-8)～1.0×10~(-5)mol/L范围内分二段呈良好的线性关系,检出限(S/N=3)为2.0×10~(-8)mol/L(富集时间90 s).方法用于生铁和合金钢样品中锡的测定,结果与电感耦合等离子体原子发射光谱法的结果一致.

A multi-walled carbon nanotubes modified acetylene carbon black microelectrode was prepared and the anodic stripping voltammetric behavior of tin on the modified electrode was investigated. As shown by experimental results, Sn (II) is accumulated and reduced on the surface of the modified electrode at -1000 mV (vs. SCE) in 1 mol/L HCI solution. When positive scanning ran from -1000 mV to 0 mV at a scanning rate of 100 mV/s, a sensitive anodic stripping peak appeared at -610 mV. The sensitivity of the modified electrode in the determination of S...