イオン交換体による陽イオンの分離（第Ⅸ報） : チタニウムを含む陽イオンの相互分離

Cation-exchange separation of K, Na, Mg, Mn, Ca. Al, Fe and P from Titanium was reported in the present paper. The exchangers used were the same as the previous paper in this journal. The buffer solution consisting of 1 mol/1 formic acid and 1 mol/1 ammonium formate solution was used for eluting these cations. As reported previously, these cations can be separated satisfactorily from each other with the buffer solution of different values of pH. On absorption of the mixed solution on the exchanger, PO³⁻⁴ was eluted through the column selectively, whereas Titanium was retained on the resin completely. It could not be eluted with the eluant of the formate buffer solution of any pH values, thus being separated from other cations. Elution of Titanium with 1N or 2N sulfuric acid was tyied after separating all other cations, but Titanium could hardly be eluted with even a large amount of the eluant. It is considered to be useful to apply anion-exchange method for the elution of Tita-nium itself.