Abstract
The first necessary condition for the smooth development in the precipitation chromatography is that the free osmosis of the developer should not be hindered by the precipitate appeared. The author ascertained that the above condition was fulfilled on a wide range of composition variance of the developer by saturating it with oxine in the development of mixed nitrates of several rare-earth elements on a sheet on oxine-containing filter paper, and investigated on the roles of acid in the developer and organic solvent employed. From the aspects of distribution of La, Ce(III), Pr and Nd on chromatograms were predicted the optimum conditions for the separation of an element from the others and the mutual separation of binary mixture with possible purification of the components. These predictions were ascertained experimentally.
