循环伏安法测定硼氢根离子

摘要

主要用圆盘Au电极的电化学循环伏安法定量分析强碱性溶液中BH4-的浓度.实验采用三电极体系,工作电极为Au电极,参考电极为Hg/HgO电极,分别用铂、石墨作辅助电极,测定了在碱性体系中,不同浓度NaBH4溶液的循环伏安图,得到相应浓度下峰值电流值,并讨论了在同一浓度下扫描速度对BH4-氧化电流的影响.实验还测量了以镍电极、铂电极为工作电极时溶液的循环伏安图,并与Au电极结果做了对比.结果表明,BH4-在Au电极上活性最高,Au电极做工作电极的三电极体系测量BH4-离子浓度是一种简单、快速的方法,在测定范围内(10-4～10-2mol/L)线性关系良好.%In this paper,the disk Au electrode of electrochemistry cyclic voltammetry was used to determine the concentration of BH4- in strong alkaline solutions. The 3-electrode system was used in the experiment, the working electrode is Au,the reference electrode is Hg/HgO,and the auxiliary electrode is Pt or C, respectively, different concentration of NaBH4 were tested in alkaline solutions. We obtain the peak current of correspond concentration and discuss the influence of different scanning speeds at the same concentration. The cyclic voltammograms of NaBH4 solution on Ni, Pt electrode was also obtained and contrast to the Au electrode, the result shows that BH/ has the highest activities on Au electrode. It is a simple and fast way to determine BH4- of 3-electrode system with Au as working electrode and the liner relation is good in the measurement range.