高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (2): 187.

• 研究论文 • 上一篇    下一篇

荧光镓的电化学行为及稀土-荧光镓络合吸附波研究

李南强, 贺维军   

  1. 北京大学化学系, 北京 100871
  • 收稿日期:1992-04-29 修回日期:1992-11-01 出版日期:1993-02-24 发布日期:1993-02-24
  • 通讯作者: 李南强
  • 基金资助:

    国家自然科学基金

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

LI Nan-Qiang, HE Wei-Jun   

  1. Department of Chemistry, Peking University, Beijing, 100871
  • Received:1992-04-29 Revised:1992-11-01 Online:1993-02-24 Published:1993-02-24

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1.0×10-8mol/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。

关键词: 荧光镓, 稀土, 伏安法

Abstract: In Britton-Robbinson buffer solution, as the pHranged from 2 to 10, an irreversible adsorptive reducing wave of lumogallion(LMG) was obtained.The electrode processes were verified as follows:(这里有图片19930211-187-1.gif)The meanings of the above symbols can be seen in the text.At pH4 and at the surface of mercury electrode, the adsorption of LMGobeys Frumkin isotherm.The area occupied by each LMGion 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-MGwere 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).

Key words: Lumogallion, Rare earth, Voltammetry

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