期刊论文

Simultaneous Determination of Benzoic Acid and Salicylic Acid by Potentiometric Titration Coupled with Multivariate Calibration Method

中文

南华大学学报(自然科学版)

1673-0062

2007

21

3

77-80

10.19431/j.cnki.1673-0062.2007.03.020

本校为第一机构

建立了一种可同时测定苯甲酸和水杨酸的电位滴定新方法.在这种方法中,滴定剂是氢氧化钠与氯化钾的混合溶液,被滴定液中同时插入了pH指示电极和氯离子指示电极.在滴定过程中的任一滴定点,溶液的pH和滴定剂的加入体积可由两个电极的电位测定值同时获得,从而可应用多元校正法由相应的滴定曲线求得混合酸中每一种酸的含量.该方法免去了滴定剂体积的直接读取,且不需确定滴定终点,因此该法简便、精确.应用本方法对样品中的苯甲酸和水杨酸进行了同时测定,结果满意.

A new potentiometric titration method coupled with multivariate calibration method for the simultaneous determination of benzoic acid and salicylic acid has been developed.In this method,the titrant is a mixture of sodium hydroxide and potassium chloride,both pH indicated electrode and chloride ion indicated electrode are inserted in the titration solution.In a process of titration,both the added volume of titrant and the solution acidity at each titr...