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Polarographic Studies of Dithiodiacetic Acid and the Uranyl‐Dithiodiacetic Acid Complex
Author(s) -
Kao ChenFeng,
Chang TsongDsu,
Lai TsaiTeh
Publication year - 1987
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198700043
Subject(s) - chemistry , polarography , uranyl , dissociation (chemistry) , diffusion , superposition principle , adsorption , inorganic chemistry , ion , analytical chemistry (journal) , thermodynamics , chromatography , organic chemistry , physics , quantum mechanics
The polarographic behaviour of dithiodiacetic acid and that of U(VI) in a solution containing dithiodiacetic acid as complexing agent have been investigated. For the dithiodiacetic acid system, two waves appear over the p H range studied. The prewave is kinetic in nature and the mainwave is diffusion‐controlled. However, as U(VI) is added into the dithiodiacetic acid system, the polarogram changes due to the existence of a complex. The current‐potential curve of the first wave is not the normal S shape. This is due to the superposition of the first wave of the ligand and the wave due to the reduction of the U(VI) in the complex to U(V). The second wave is due to the reduction of the complex The first wave is an adsorption‐controlled current and the second wave is partly diffusion‐controlled and partly adsorption‐controlled. We propose an electrode reaction mechanism for both systems and the complex species. The dissociation constant of the complex HASSAUO + 2 is found to be of the order of 10 −4 .