Abstract: In the 0.2mol/Lacetate buffer solution, at pH 4.8, a sensitive adsorptive wave of RE( Ⅲ)-Zn( Ⅱ )-ALCisonuclear complex was obtained by means of single-sweep polarograph with the exception of scandium. The limit of detection is 2.0×10^-8 mol/Lfor light rare earth ions. The composition of the isonuclear complex was determined as RE( Ⅲ ):Zn( Ⅱ ):ALC = 1: 1 :2 by using the polarographic continuous variation method and the analysis of the isonuclear complex precipitate. The electrode processes of the adsorptive wave may be represented as follows:(这里有图片1989067-591-1.gif)where L' is the anthrahydroquinone anion of ALC.

Key words: Isonuclear complex of rare earth ion, Polarographic adsorptive wave, Single-sweep polarograph