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化学学报
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化学学报 ›› 1988, Vol. 46 ›› Issue (7): 651-656. 上一篇    下一篇

研究论文

钴(II)-丁二酮肟-亚硝酸盐体系极谱催化波的机理研究

倪亚明;李玲;高小霞   

  1. 北京大学化学系
  • 发布日期:1988-07-15

Study on the polarographic catalytic wave of the cobalt(II)-dimethylglyoxime-nitrite system

NI YAMING;LI LING;GAO XIAOXIA   

  • Published:1988-07-15

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在氨性底液(PH8)中, 钴(II)-丁二酮肟(DMG)-亚硝酸盐体系产生高灵敏的极谱催化波. 利用吸附伏安法, 测定下限可达1×10^-^1^1mol.dm^-^3Co. 我们用多种电化学方法和紫外可见分光光度法证明, 吸附在汞电极表面的[NH4]2[Co(DMG)2(NO2)2]是有很高电活性的混配化合物, 在复杂的电还原过程中, 不仅Co(II)和DMG被催化还原, 而且NO2^-也被催化还原, 从而产生很大的催化电流, 本文再一次证明, “活性钴"在催化波的形成过程中起着重要的作用.

关键词: 紫外分光光度法, 伏安法, 极谱分析, 肟, 丁二酮 P, 钴络合物, 电化学分析, 催化波, 亚硝酸盐, 国家自然科学基金

A very sensitive polarog. catalytic wave is obtained in the cobalt(II) - dimethylglyoxime (DMG) - NO2- - NH4Cl - NH3 (pH 8) system. The adsorption voltammetric limit of detection of cobalt is 1 ?10-11 mol dm-3. It is shown that (NH4)2[Co(DMG)2(NO2)2] adsorbed on the hanging mercury electrode is a highly active mixed-ligand complex. During the irreversible reduction of this complex not only Co(II) and DMG are reduced, but also NO2- is catalytically reduced. "Active cobalt" or its complex, which is formed at the electrode surface, plays an important part in this polarog. catalytic wave.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, VOLTAMMETRY, POLAROGRAPHIC ANALYSIS, OXIME, BUTANEDIONE P, COBALT COMPLEX, ELECTROCHEMICAL ANALYSIS, CATALYTIC WAVE, NITRITE, NSFC

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