高等学校化学学报

高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (2): 131.

• 研究论文 • 上一篇    下一篇

电流反馈的高次微分示波极谱滴定法

杨昭亮, 高鸿   

  1. 南京大学化学系
  • 收稿日期:1988-05-30 出版日期:1990-02-24 发布日期:1990-02-24
  • 通讯作者: 杨昭亮
  • 基金资助:

    国家自然科学基金

Oscillopolarographic Titrations Using Higher Order Differentiation and Feeding Back Current

Yang Zhaollang, Gao Hong(H Kao)   

  1. Chemistry Department, Nanjing University, Nanjing
  • Received:1988-05-30 Online:1990-02-24 Published:1990-02-24

PDF (PC)

被引次数

13

摘要： 在高次微分示波极谱滴定法中,利用电流反馈技术对充电电流进行补偿,可使高次微分示波极谱图上去板剂切口的灵敏度进一步提高。当切口电位处的|dCd/dE|或|d2C4/dE2|值相对较小时,电流反馈的作用就较明显。利用电流反馈高次微分示波极谱滴定法以氨羧络合剂滴定了Cd2+、Ni2+、Co2+、Pb2+、Zn2+,用Zn2+返滴定法测定了Al-Ni合金中的Ni,终点变化敏锐。

关键词: 示波极谱滴定, 络合滴定, Al-Ni合金

Abstract: In some cases, feeding back a current proportional to dE/dt will make the incision on the higher order differentiation more sensitive. The end-point will be very sharp. Smaller | dCd/dE | and | d2Cd/dE2| values at the incision potential make the incision sensitivity increase to a greater extent by feeding back a current. Using ion incisions on the higher order differentiations to indicate the end-point of titrations, Cd2+, Ni2+, Co2+, Pb2+ and Zn2+ can be directly titrated with EDTAor CyDTA, Ni in Al-Ni alloy can be accurately determined by addition of excess EDTAfollowed by back titrations of the excess amount with Zn2+.

Key words: Oscillopolarographic titration, Chelometric titration, Al-Ni alloy

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