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 k_s1=4.4s^-1, k_s2=1.74s^-1, k_s3=10.8s^-1.

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

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k_s1、k_s2、k_s3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