物理化学学报 >> 1990, Vol. 6 >> Issue (03): 341-346.doi: 10.3866/PKU.WHXB19900317

研究论文 上一篇    下一篇

核固红及稀土核固红极谱行为的研究

闵静; 李南强   

  1. 北京大学化学系
  • 收稿日期:1988-09-29 修回日期:1989-11-23 发布日期:1990-06-15
  • 通讯作者: 李南强

Studies on the Polarographic Behaviors of Nuclear Fast Red and the Rare Earth(III)-Nuclear Fast Red System

Min Jing; Li Nan-Qiang   

  1. Department of Chemistry, Peking University, Beijing
  • Received:1988-09-29 Revised:1989-11-23 Published:1990-06-15
  • Contact: Li Nan-Qiang

摘要: 在由酸性至碱性的水溶液中均获得了核固红的极谱吸附波, 证实在酸性底液中核固红在汞电极上的吸附符合Frumkin等温式. 对pH由7至11的碱性底液中核固红电还原的ECE机制作了研究, 还获得并研究了在pH11附近, 乙二胺-氯化钾底液中的稀土-核固红体系的极谱络合吸附波。

Abstract: In acidic or basic buffer solution, nuclear fast red (NFR) exhibits an adsorptive wave. The electrode processes have been verified as an ECE mechanism. The rate constant of the first order chemical reaction following electrochemical reaction has been measured by means of cyclic voltammetry. At pH 4.75, on the surface of mercury electrode, the adsorption of NFR obeys Frumkin isotherm. The adsorption coefficient β= 7.2×10~6 and the interaction factor υ=0.39 have been determined. In the supporting electrolyte containing 0.1 mol·L~(-1) ethylene diamine and 0.3 mol·L~(-1) KCl, at pH 11, the polarographic adsorptive complex wave of RE(III)-NFR has been obtained by using single-sweep polarograph. The electrode processes has been studied.