北京大学学报(自然科学版)

铟-荧光镓极谱络合吸附波的研究

包晓玉, 朱志伟, 李南强   

  1. 北京大学化学与分子工程学院,北京,100871
  • 收稿日期:1998-12-01 出版日期:2000-03-20 发布日期:2000-03-20

Studies on Polarographic Adsorptive Complex Wave of Indium(III)-lumogallion

BAO Xiaoyu, ZHU Zhiwei, LI Nanqiang   

  • Received:1998-12-01 Online:2000-03-20 Published:2000-03-20

摘要: 在pH 5.5的0.1mol/L(CH2)6N4-HCl底液中可获得铟(Ⅲ)-荧光镓体系灵敏的络合吸附波。测定铟的线性范围为1.0×10-7~1.0×10-5mol/L,检测限达8×10-8mol/L, 测得电活性络合物的组成为铟∶荧光镓=1∶2,条件形成常数β=3.6×1013,表面电极反应速率常数ks1ks2ks3分别为4.4、1.74、10.8s-1,并研究了电极反应机理。

关键词: 铟, 荧光镓, 单扫极谱法, 循环伏安法

Abstract: In (CH2)6N4-HCl buffer solution at pH 5.5, a sensitive adsorptive complex wave of In(III)-lumogallion(LMG) was obtained by single-sweep polarography. The change of peak height with the concentration of indium is linear in the range from 1.0×10-7mol/L to 1.0×10-5mol/L. The detection limit is down to 8×10-8mol/L. The composition of the complex was detected as In(III): LMG=1:2. The conditional stability constant was determined as β=3.6×1013. The rate constant of the surface electrochemical reaction was determined as ks1=4.4s-1, ks2=1.74s-1, ks3=10.8s-1.

Key words: Indium, lumogallion, single-sweep polarography, cyclic voltammograms

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