高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (9): 1368.

• 研究简报 • 上一篇    下一篇

两维pH滴定法同时测定混合极弱酸碱

朱仲良, 李通化, 鲁准军   

  1. 同济大学化学系, 上海, 200092
  • 收稿日期:1994-10-26 修回日期:1995-03-04 出版日期:1995-09-24 发布日期:1995-09-24
  • 通讯作者: 李通化
  • 作者简介:朱仲良,男,33岁,硕士,讲师.
  • 基金资助:

    国家自然科学基金

Simultaneous Determination of Mixture of Very Weak Acids or Bases by Two-dimensional pH-Titration

ZHU Zhong-Liang, LI Tong-Hua, LU Zhun-Jun   

  1. Department of Chemistry, Tongji University, Shanghai, 200092
  • Received:1994-10-26 Revised:1995-03-04 Online:1995-09-24 Published:1995-09-24

关键词: 两维pH滴定, 极弱酸碱, 同时测定, 主成分回归法

Abstract: A new method,two-dimensional pH-titration, for simultaneous determination of mixture of very weak acids or bases is proposed.Titration volume data matrix is measured at different fixed pH values.Principal component regression is carried out to simultaneously determine every component in the mixtures.The systematic deviations of pHmeasurement do not affect the accuracy of determination results.The mixtures of p-chlorophenol and o-chlorophenol and the mixtures of citrate and tartrate are determined.The relative error is lower than 0.5% and 1%, respectively. Effects of the resolution △pKa and sampling interval △ pH are studied.The relative error is lower than 1% when △pKa△ >0. 4 and △pH=0.1.

Key words: Two-dimensional pH-titration, Very weak acid and base, Simultaneous determination, Principal component regression

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