Synthesis and Ion-Exchange Properties of Reproducible Stannic Molybdoarsenate. Separations of Ba 2+ –La 3+ , Mg 2+ –La 3+ , Sr 2+ –Y 3+ , and Sr 2+ –La 3+

A new inorganic ion exchanger, stannic molybdoarsenate, has been prepared by treating a 0.25 M solution of stannic chloride with a mixture of a 0.25 M solution of sodium arsenate and sodium molybdate in the volume ratio Sn:Mo:As 2:1:1 at different pH values (0, 1, and 2). It may be used for the binary separation of Ba2+–La3+, Mg2+–La3+, Sr2+–Y3+, and Sr2+–La3+.