高等学校化学学报

高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (3): 311.

• 论文 • 上一篇    下一篇

钴(Ⅱ)-丁二酮单肟烟酰腙-亚硝酸盐体系的伏安行为及其应用

许宏鼎1, 刘再新1, 张丽君2   

  1. 1. 吉林大学化学系, 130021;
    2. 苏州城建环保学院
  • 收稿日期:1989-09-23 出版日期:1991-03-24 发布日期:1991-03-24
  • 通讯作者: 许宏鼎
  • 基金资助:

    国家自然科学基金

The Voltammetric Behaviour of Co (Ⅱ)-DMNH-NO2System and Its Analytical Application

Xu Hong-ding1, Liu Zai-xin1, Zhang Li-jun2   

  1. 1. Department of Chemistry, Mm University, Changchun, 130021;
    2. Department of Environment Protection, College of Urben Construction and Environment Protection, Suzhou
  • Received:1989-09-23 Online:1991-03-24 Published:1991-03-24

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被引次数

5

摘要： 在氨性介质中(pH=9.0),钴(Ⅱ)-丁二酮单肟烟酰腙(DMNH)-亚硝酸盐体系可产生灵敏度很高的催化波。从体系的伏安行为可知,吸附于汞电极上的是混配的配盐NH4[Co(Ⅱ)(DMNH)·(NO2)2],在-1.0V(相对SCE)处,Co(Ⅱ)被还原至Co(0),DMNH被还原成自由基,由于NO2-的存在,自由基可参与再生反应而形成催化波。羟氨的存在可使产生催化波的最佳pH值移至8.2.用此体系进行了生物样品中钴的测定,其检出限为1×10-10mol/L。

关键词: 钴的伏安行为, 钴的测定, 丁二酮单肟烟酰腙

Abstract: A sensitive catalytic wave can be obtained in Co(Ⅱ)-DMNH(1,2-dimethyl-2-nicotinic hy-drazone ethyleneoxime)-NO2-system (pH=9). The voltammetric behaviour of this system is studied in this paper. Acompound NH4Co(DMNH)(NO2)2was adsorbed on the surface of hanging drop mercury electrode at-0. 70 V(vs. SCE). In cathodic scanning, NO2-could be reduced catalytically by it at -1. 0 Vand produced a catalytic wave. If hydroxyamine exists in above base solution, the catalytic wave is also obtained, but the optimum acidity is shifted from pH 9 to 8. 2. Using latter system, the content of cobalt in biological samples was determined by adsorptive stripping voltammetry. The results of analysis were satisfactory. The detection limit of cobalt is 1×10-10mol/L.

Key words: Voltammetric behaviour of cobalt, Determination of cobalt, 1,2-Dimethyl-2-nicotinic hydrazone ethyleneoxime

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