Yoshinori Fujiki

ION-EXCHANGE PROPERTIES OF HYDROUS TITANIUM DIOXIDE WITH A FIBROUS FORM OBTAINED FROM POTASSIUM DITITANATE

ABSTRACT Ion-exchange properties of a new type of hydrous titanium dioxide with a fibrous form, which was obtained from potassium dititanate (K2O(TiO2)2), have been studied. The pH titration curve snowed that this material behaved as a bifunctional ion-exchanger. Distribution coefficients of some divalent metal ions on this material were measured as a function of pH and the selectivity series were found to be Ba > Sr > Ca > Mg for alkaline earth metal ions and Cu > Zn > Mn > Co > Ni for divalent transition metal ions. Large separation factors were obtained between some metal ion pairs and the mutual separations such as Cu from Sr, Ca, Mg, Co and Ni, and Mg from Ba and Zn have been achieved on columns of this material.

Sorption Properties and Some Separations of Divalent Transition Metal Ions on Crystalline Hydrous Titanium Dioxide Fibers

Abstract The sorption of some divalent transition metal ions and strontium ion on crystalline hydrous titanium dioxide fibers has been studied. Crystalline hydrous titanium dioxide fibers were obtained by extracting potassium ions from potassium tetratitanate (K2Ti4O9) fibers; their composition was TiO2 -0.6H2O. It was confirmed that these metal ions were sorbed on this material by an ion-exchange reaction, and their selectivity series Cu > Sr > Zn > Mn > Co > Ni was established. Large separation factors were obtained between copper ion and other divalent transition metal ions, and some mutual separations have been achieved on a column containing crystalline hydrous titanium dioxide fibers.

Detection limit by electron probe microanalysis

EPMAの最大の特徴は微小部分の分析であり,微量成分の検出感度・分析精度はとくに良好とは云えない。また機種・分光結晶の選択その他の条件により,その感度・精度はことなる。ここでは微小部の分析という点との関連もあり,微量の検出感度と位置的な分解能ともいうべき粒界部の微量の検出の両者を考えることとする。