Electrochromatography. IX'X

Abstract

With the same method as using of Na4P2O7 in the 5 th report of this series, the pH of aqueous solutions of Na5P3O10 or Na6P4O13 was modified by adding hydrochloric acid in order to change the stabilities of complex ions, the filter paper was saturated with this solution, ionic spots on the filter paper were allowed to migrate toward the anode or cathode by applying the direct current. When the solution was alkaline, each ion was converted into a complex ion and migrated toward the anode, and the separation was not efficient as the relative migration velocity of each ion was close to each,other, while turning of the pH of the solution below 2 caused the lowering of the stability which was different for each ion and the mutual separation of them were possible. Thus, for example, Cu2+, Cd2+, Bi3+, and Pb2+, Al3+, Fe3+, and CrO42-; and Ni2+, Co2+ and Zn2+ were separated in acid range. Either Na5P3O10 or Na6P4O13 gave different state of ionic separation than that of using Na4P2O7. © 1955, The Japan Society for Analytical Chemistry. All rights reserved.