中华医学超声杂志

应用化学 ›› 1989, Vol. 0 ›› Issue (6): 74-76.

• 研究简报 • 上一篇    下一篇

示波指示技术在动力学分析法中的应用 Ⅰ.利用KBrO3-KBr-HCI体系测定还原性物质

徐伟建, 刘燕, 高鸿   

  1. 南京大学化学系
  • 收稿日期:1988-12-30 修回日期:1989-06-26 出版日期:1989-12-10 发布日期:1989-12-10
  • 基金资助:
    国家自然科学基金

OSCILLOGRAPHIC INDICATION TECHNIQUE IN KINETICALLY CONTROLLED ANALYSIS Ⅰ.DETERMINATIONS OF REDUCING SUBSTANCES WITH KBrO3-KBr-HCl SYSTEM

Xu Weijian, Liu Yan, Gao Hong(H. Kao)   

  1. Department of Chemistry, Nanjing University
  • Received:1988-12-30 Revised:1989-06-26 Published:1989-12-10 Online:1989-12-10

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摘要： 示波滴定至今主要用于常量或半微量分析[1]。示波滴定终点指示技术能否在微量和痕量分析中发挥作用是一个需要探索的新课题。本文报道用零电流示波双电位指示技术[2,3]与动力学分析相法[4,5]相结合的方法测定微量还原性物质。

关键词: 示波指示技术, 示波双电位法, 动力学分析法

Abstract: This paper reports the use of the oscillographic indication technique in the kinetic method of analysis.The product resulted from the kinetic reaction in KBrO3-KBr-HCl system is used as a titrant and the zero current oscillographic bipotentiometric titrationtechnique is used to indicate the end point. The results obtained with KBrO3-KBr-HCl system show that this method can be used to determine reducing substances such as As(Ⅲ),ascorbic acid,etc.and has a sensitivity about 10-6-10-7mol/dm3.This method is directly visible and rapid and needs only simple equipment.

Key words: Oscillographic indication technique, Oscillographic bipotentiometry Kinetic method of analysis

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