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纸上色层法在放射化学中的应用已日趋广泛。本文提出了一种新的纸上分配色层法,将有机萃取剂直接涂在滤纸上作为固定相,各种无机酸的水溶液为流动相。该法分离放射性同位素Sr~(90)—Y~(90)获得成功,而且由此所得的Y~(90)是无载休放射性同位素。分离Sr~(90)-Y~(90)的最好条件是以二(-2-乙基己基)磷酸酯(D2EHPA)为固定相,0.5N的盐酸溶液为流动相。用磷酸三丁酯(TBP),为固定相的反相纸上分配色层法,也能很好地将铀和其他十几种无机离子分离;同时,测定了作为流动相的硝酸浓度对UO_2~(++)和其他离子R_f值的影响。此外,本文还讨论了反相纸上分配色层法与液相萃取之间的关系,认为涂在纸上的有机萃取剂的含量和流动相的酸度对被分离元素R_f值的影响,可以用液相萃取的机构来解释。
Paper chromatography has become more widely used in radiochemistry. In this paper, a new method of paper color distribution is proposed. The organic extractant is directly applied on the filter paper as the stationary phase, and the aqueous solution of various inorganic acids is used as the mobile phase. The method succeeded in separating the radioactive isotope Sr ~ (90) -Y ~ (90), and the resulting Y ~ (90) was radioactive isotope. The best conditions for the separation of Sr ~ (90) -Y ~ (90) were as follows: di-2-ethylhexyl phosphate (D2EHPA) as stationary phase and 0.5N hydrochloric acid as mobile phase. The separation of uranium and a dozen of other inorganic ions by TBP, reversed phase chromatography on a stationary phase, can also be used to separate uranium from other inorganic ions. At the same time, the effect of nitric acid concentration as mobile phase on the stability of UO_2 ~ (++) and other ions R_f value. In addition, the paper also discusses the relationship between the reversed-phase paper chromatography and the liquid-phase extraction. It is considered that the content of the organic extractant and the acidity of the mobile phase on the paper are affected by the value of Rf, Liquid extraction mechanism to explain.