摘要
实验采用循环伏安法,用镍电极代替铂铑等贵金属电极测定了碱性体系中不同硼氢根离子浓度下的开路电位,得出了研究电极的开路电位(-0·355^-0·280vs.SCE/V)与微量硼氢根离子浓度的对应关系,并用于监测电解偏硼酸钠制备硼氢化钠体系中微量硼氢根离子,同时计算了该方法的误差。结果表明,测量结果的相对标准偏差为2·2%;回收率为98·4%。该法简单、快速,可测定10-5~10-3mol/L范围的硼氢根离子浓度。
An electrochemical cyclic vohammetric method was developed to determine microcontcnt borohydride. With different borohydride concentrations in strongly alkaline solutions, the method was applied to determine open circuit potential of nickel electrode in stead of electrodes of noble metals such as Pt or Rh. The quantitative relationship between open circuit potential（-0.3550--0.2800 vs. SCE/V） and the concentrations of borohydride ions （10^-5-10^-3 mol/L） was given. Meanwhile, electrochemical reduction of sodium metaborate was used to produce sodium horohydride for monitoring microcontent horohydride systems by this method. The experimental results show that the relative standard deviation for the nickel electrode system is less than 2.2%, and the recovery rate is over 98.4%. It is proved that this method is an easier and quicker way to determine 10^-5-10^-3 mol/L microcontent borohydride in alkaline solution.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2006年第U09期145-147,共3页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金(No.20276045)
山西省自然科学基金(No.20031025)资助
关键词
开路电位
微量硼氢根
镍电极
Open circuit potential, microcontent borohydride, nickel electrode
