Crystalline (c-SnSbAs) and amorphous (a-SnSbAs) samples of tin(IV) antimonoarsenate were prepared at different pH values from 0 to 5. Crystalline and amorphous samples, prepared at pH 1 having ion exchange capacities of 1.00 meq/g and 0.90 meq/g respectively, were selected for further studies. The materials show high thermal and chemical stability. Distribution coefficients (K-d values) for 22 metal ions have been determined in demineralised water. Structural studies based on IR, XRD, TGA, DTA are discussed. Some quantitative binary separations such as Mg2+-Mn2+, Cd2+-Mn2+, Ba2+-Mn2+ and Ni2+-Cu2+ were achieved on a-SnSbAs and ion selective electrodes prepared from c-SnSbAs are reported.