零流电位法在酸碱滴定中的应用研究  

Study on the application of zero current potentiometry in acid-base titration

作　　者：何旭伦[1] 卢平[1] 梁勇[1] 武耐英[2] 徐茂田[2] 

机构地区：[1]华南师范大学化学与环境学院,广东广州510000 [2]商丘师范学院化学系,河南商丘476000

出　　处：《化学研究与应用》2012年第4期531-535,共5页Chemical Research and Application

基　　金：国家自然科学基金项目(20775047);河南省科技攻关项目(102102310392)资助

摘　　要：探讨了零流电位法在酸碱滴定中的检测原理及应用,通过考察强碱滴定弱酸、强碱滴定强酸、强酸滴定弱碱以及强酸滴定强碱四种滴定体系,探明了零流电位法在酸碱滴定中的适用性。通过氢氧化钠滴定醋酸对本方法进行评价,实验结果表明:本法的相对误差为-0.4%,同一根电极的滴定值的相对标准偏差(RSD)为0.4%(n=5),同一根电极五天滴定值的RSD为0.6%,五根电极滴定值的RSD为0.5%。本方法具有较高的准确性、稳定性和重现性。The measurement principle and application of zero current potentiometry in acid-base titration were discussed.Both the titrations of weak acid（strong acid） by strong alkaline and weak alkaline（strong alkaline） by strong acid were tested to demonstrate the applicability of zero current potentiometry in acid-base titration.Overall method performance was investigated using the titration of acetic acid by sodium hydroxide.The relative error of this method was-0.4% and the RSD of the same electrode was 0.4%（n = 5）.The RSD of the same electrode for 5 days successive assays was 0.6% and the RSD of five electrodes was 0.5%.The experimental results showed that zero current potentiometry exhibits higher accuracy,stability and repeatability.

关 键 词：酸碱滴定 电位滴定 零流电位法 

分 类 号：O657.1[理学—分析化学]