期刊论文

中文

应用化学

1000-0518

2008

25

6

718-721

10.3969/j.issn.1000-0518.2008.06.022

衡阳师范学院科研启动基金（2006832）资助项目

本校为第一机构

采用溶胶-凝胶法制备了纳米TiO_2粉末，成功地将其修饰在碳糊电极上，用阳极溶出伏安法考察了修饰电极测量痕量铟的优化条件及其电化学稳定性。结果表明，在pH=5．4的HAc-NaAc缓冲液中．当In~(3＋)在纳米TiO_2修饰碳糊电极表面富集时间为200s,电位扫描速率控制为200mV／s时,修饰电极在伏安图上能出现1个灵敏的氧化峰，峰电位为-0．832V，利用该峰可以进行痕量铟的检测；峰电流与In~(3＋)浓度在1．0×10~(-11)-1．0×10~(-9)mol／L的范围内成良好线关系，相关系数为0．995，检出限为0．125×10~(-11)mol／L；修饰电极稳定性较好，用于实际水样中铟含量的测定，平均回收率为96．16％，结果令人满意...

Nano-TiO2 powder prepared by sol-gel method was used to modify carbon paste electrode successfully. Optimum conditions for detection of trace indium at the modified electrode and the electrochemistry stability of the modified electrode were investigated by simultaneous cyclic voltammetry. There was a sensitive oxidation peak in the voltammogram at - 0. 832 V characteristic of trace indium in HAc-NaAc buffer whose pH was 5.4 when the accumulation time was 200 s and the potential scan rate was 200 mV/s. There was a good liner relationship between...