Studies on the selective separation of rubidium on a titanium(IV) tungstoarsenate column

Abstract

The heteropolyacid salt titanium tungstoarsenate has been prepared by adding titanium(IV) chloride to a mixture of sodium arsenate and tungstate. The product, prepared under optimum conditions, has an exchange capacity of 0.86 mequiv. g^–1 and is stable in acidic and salt solutions. It is possible to separate selectively Rb⁺ from Ag⁺, Pb²⁺, Ba²⁺, Sr²⁺, Mg²⁺, Cd²⁺, Fe³⁺, Cr³⁺, etc., ions on a column of this exchanger material. It can also be used for the sorption and removal of some stable radioactive pollutants.