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本文提出了镧-8-羟基喹啉-马来酸-氯化钾的示波极谱络合吸附波。在-1.50V(SCE)电位处有一个8-羟基喹啉的还原波P_1,La~(3+)的加入使P_1减小,而在较负电位出现一个新波P_2。P_1的降低与5×10~(-17)～5×10~(-6)MLa~(3+)浓度有线性关系,用于测定样品(LaGd)_2O_2S中的La,得到满意的结果。实验证明P_2是La~(3+)与8-羟基喹啉和马来酸的三元络合阴离子的吸附波,其配位比为La~(3+)∶8-羟基喹啉:马来酸=1∶3∶1。
In this paper, the oscillopolarographic complex adsorption wave of lanthanum-8-hydroxyquinoline-maleic acid-potassium chloride has been proposed. At a potential of -1.50V (SCE), a reducing wave P_1 of 8-hydroxyquinoline was added, and the addition of La 3+ reduced P 1 and a new wave P_2 appeared at the more negative potential. The decrease of P_1 was linear with the concentration of 5 × 10 ~ (-17) ~ 5 × 10 ~ (-6) MLa ~ (3 +), and was used to determine La in sample LaGd_2O_2S. Satisfactory results were obtained. The experiment proves that P 2 is the adsorptive wave of La ~ (3+) with ternary complex anion of 8-hydroxyquinoline and maleic acid with the coordination ratio of La ~ (3+): 8-hydroxyquinoline Acid = 1: 3: 1.