cf. CA 62, 8420a.Adsorption of alkali metal ions was studied on phenol-H2CO resin (Duolite C-3, 10-50 mesh), sulfonated polystyrene-divinylbenzene resin (Dowex 50-X8, -400 mesh, H+ form), and Zr phosphate (Bio-Rad ZP-1, 100-200 mesh) from aqueous and aqueous-methanolic HCl.Adsorbability on Dowex 50-X8 was larger in 80% MeOH than in aqueous solutionsThe ratios of adsorbabilities of K, Rb, and Cs on Dowex 50-X8 decreased slightly and that of Li, Na, and K increased with increasing MeOH concentrationThe ratios of adsorbabilities of Li, Na, and K are the same for Duolite C-3 and Dowex 50-X8.The ratios of adsorbabilities of K, Rb, and Cs are larger for Duolite C-3.The ratios of adsorbabilities of Li, Na, and K on Duolite C-3 in 80% MeOH solution were about the same as for Dowex 50-X8.The ratios of adsorbabilities of K, Rb, Cs, and Fr in 80% MeOH were much larger with Duolite C-3 than with Dowex 50-X8.With both Dowex 50-X8 and Duolite C-3, separation of Li+ from Na+ and Na+ from K+ and other alkali metals is improved through use of HCl-H2O-MeOH mixturesBio-Rad ZP-1 was useful in separating Rb from K, especially when Rb: K ratio is small.