荧光镓的电化学行为及稀土-荧光镓络合吸附波研究  

Studies on the Voltammetric Behaviors of Lumogallion and Rare Earth-Lumogallion

作　　者：李南强[1] 贺维军[1] 

机构地区：[1]北京大学化学系,北京100871

出　　处：《高等学校化学学报》1993年第2期187-191,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：本文研究了荧光镓在pH 2～10底液中的伏安行为。证实其偶氮基首先还原为氢化偶氮,然后通过氢化偶氮的歧化反应或二电子还原生成相应的胺化物。荧光镓在汞电极上的吸附符合Frumkin等温式。在pH 9.5的氨性底液中可获得稀土-荧光镓的络合吸附波。对重稀土的检测限为1.0×10^(-8)mol/L。测定了电活性络合物的组成及发光材料BaFCl:Ho中钬的含量。In Britton-Robbinson buffer solution, as the pH ranged from 2 to 10, an irreversible adsorptive reducing wave of lumogallion(LMG) was obtained. The electrode processes were verified as follows:The meanings of the above symbols can be seen in the text.At pH 4 and at the surface of mercury electrode, the adsorption of LMG obeys Frumkin isotherm. The area occupied by each LMG ion at the electrode surface was measured as 89×10-2 nm2.In 0. 2 mol/L NH3-NH4Cl buffer solution, at pH 9. 5, the sensitive adsorptive complex waves of rare earth ions-MG were obtained by single-sweep polarography. It can be formed by all rare earth ions, but the heavy rare earth are more sensitive than the light rare earth. The composition of the elec-troactive complexes were determined as RE (Ⅲ): LMG=1: 2. The proposed method has been applied to the determination of holmium content in luminescent material(BaFCl : Ho).

关 键 词：荧光镓 稀土 伏安法 络合吸附波 络合物 电化学分析 

分 类 号：O614.33[理学—无机化学] O657.1[理学—化学]