高精密恒电流库仑滴定法测定苯甲酸纯度  

Determination the purity of Benzoic acid by high precision constant current coulometry

作　　者：吴冰[1] 陈启跃 向鹏飞 

机构地区：[1]中国计量科学研究院,北京100013 [2]北京同洲维普科技有限公司,北京102209

出　　处：《现代仪器与医疗》2013年第2期64-66,共3页Modern Instruments & Medical Treatment

摘　　要：高精密恒电流库仑法是国际上公认的基准测量方法,根据法拉第电解定律,通过质量、电阻、电动势、时间等基本物理量及法拉第常数来进行样品测定,直接溯源到国际单位SI,不需要用标准物质进行比对。采用高精密恒电流库仑法测定苯甲酸纯度,测定结果扩展不确定度:0.014%,实验证实该方法具有高准确性,测量精度<0.02%。The purity of benzoic Acid is determined by high prectsion constant current coulometry. The method as a primary method is recognized in international. It based on Faraday＇s law of electrolysis has been successfully used to determine purity of sample. The measuring results depend directly on the reliability of measuring physical quantities （mass, resister, voltage, time） and fundamental constants expressed in SI units and do not need a reference material for comparison. The expanded uncertainty of measurement result is 0.014%. The method is provided with high accurate, and the precise is less than 0.02%.

关 键 词：高精密恒电流库仑法 基准测量方法 基准试剂 苯甲酸 

分 类 号：O657.12[理学—分析化学]