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化学学报
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化学学报 ›› 1982, Vol. 40 ›› Issue (9): 797-802. 上一篇    下一篇

论文

紫脲酸铵-镉络合物的极谱研究

郭渡, 汪尔康   

  1. 中国科学院长春应用化学研究所
  • 投稿日期:1981-04-07 发布日期:2013-06-03
  • 通讯作者: 汪尔康

POLAROGRAPHIC STUDY OF CADMIUM COMPLEX WITH MUREXlDE

GUO DU, WANG ER-KANG   

  1. Changchun Institute of Applied Chemistry, Academia Sinica
  • Received:1981-04-07 Published:2013-06-03

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研究了镉与紫脲酸铵形成络合物的极谱性能,计算其络合物稳定常数和扩散系数。镉与紫脲酸铵单独存在于所研究的缓冲液中,分别在-0.45V和-0.1OV各产生良好的极谱还原波,但当它们共存于试液中时,则产生四个极谱还原波,分别在-0.1OV,-0.25v,-0.45v和-0.60V。实验证明,第一波为自由紫脲酸根的还原波,第二波为键合于镉络合物的紫脲酸根的还原波,第三波为自由镉离子还原波,第四波则为键合于紫脲酸络合物的镉的还原波。对络合物形成机理和电极过程进行了研究。

The polarographic behaviour of cadmium complex with murexide,including the calculation of stability constant,has been studied in detail in this paper.Cadmium and murexide waves appear at about -0.45V and -0.10V respectively in separated solution.Four reducible waves appear at about -0.10V,-0.25V,-0.45V and -0.6V respectively in a mixed solution of cadmium with murexide under certain conditions.It has been proved that the first wave is the result of the reduction of free murexide,the second is of murexide bound in the complex,the third is of free cadmium ion,and the fourth is of cadmium bound in the complex.The mechanism of the complex formation and the electrode reaction was discussed.The stability eonstant and the diffusivity of the oomplog wero calculated.