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研究了有EDTA存在于溶液时,CO~(2+)在树脂相内的扩散速率。发现了当溶液中的[CoY~(2-)]/[Co~(2+)]比值大于某一数值时,Co~(2+)在树脂相的扩散速度突然降低。不但如此,与此同时还出现了“死时间”,在“死时间”内,Co~(2+)不能越过树脂相界面进入溶液,也不能从溶液进入树脂相。这些实验事实不能按Маторина等提出的观点加以解释。在研究了全部实验结果之后,我们认为,观察到的实验事实是由于CoY~(2-)在树脂和溶液界面吸附的结果。
The diffusion rate of CO ~ (2+) in the resin phase was studied in the presence of EDTA in solution. It was found that when the ratio of [CoY ~ (2 -)] / [Co ~ (2+)] in the solution is greater than a certain value, the diffusion rate of Co ~ (2+) in the resin phase suddenly decreases. Not only this, but “dead time” also appears at this time. During the “dead time”, Co 2+ can not enter the solution beyond the resin phase interface and enter the resin phase from the solution. These experimental facts can not be explained by the viewpoints proposed by Маторина et al. After studying all the experimental results, we consider that the observed experimental fact is due to the adsorption of CoY2- at the resin-solution interface.