动力学分光光度法快速测定高pH值  

Kinetic Spectrophotometric Determination of High pH Values

作　　者：赵永红[1] 陈天禄[2] 刘志宏[2] 吕利光 

机构地区：[1]江西理工大学,江西赣州341000 [2]中国科学院长春应用化学研究所,吉林长春130022 [3]河南济源市环境监测站,河南济源454650

出　　处：《分析测试学报》2006年第2期103-105,共3页Journal of Instrumental Analysis

摘　　要：利用酚酞等指示剂分子在高pH值区的褪色反应是假一次动力学的原理，提出了一种简单的动力学分光光度方法，用于快速、准确地测定高pH值。该方法的测定范围在pH12．2～14．0，误差在0．05—0．2个pH单位以内，而且pH值越高时误差越小，与传统的滴定分析相比，操作简单，消耗试剂少。Based on the pseudo-first order kinetic process of the discoloration of phenolphthalein at high pH value, a rapid and accurate method for the determination of high pH value was developed. The pH determination range of this method was 12. 2 - 14.0 and the errors were within 0. 05 -0. 2 pH unit. It was found that the higher the pH value, the smaller the error. Compared with the conventional titration method, this method is simple and consumes less reagents.

关 键 词：动力学光度法 酚酞 PH值 测定 

分 类 号：O657.32[理学—分析化学]