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零流电位法在酸碱滴定中的应用研究
引用本文:何旭伦,卢平,梁勇,武耐英,徐茂田.零流电位法在酸碱滴定中的应用研究[J].化学研究与应用,2012,24(4):531-535.
作者姓名:何旭伦  卢平  梁勇  武耐英  徐茂田
作者单位: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
基金项目:国家自然科学基金,河南省科技攻关项目
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。

关 键 词:酸碱滴定  电位滴定  零流电位法

Study on the application of zero current potentiometry in acid-base titration
HE Xu-lun , LU Ping , LIANG Yong , WU Nai-ying , XU Mao-tian.Study on the application of zero current potentiometry in acid-base titration[J].Chemical Research and Application,2012,24(4):531-535.
Authors:HE Xu-lun  LU Ping  LIANG Yong  WU Nai-ying  XU Mao-tian
Institution:1.School of Chemistry and Environment,South China Normal University,Guangzhou 510000,China;2.Department of Chemistry,Shangqiu Teachers College,Shangqiu 476000,China)
Abstract: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.
Keywords:acid-base titration  potentiometric titration  zero current potentiometry
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