Ion-exchange behavior of stannic selenoiodate and stannic selenosilicate: analytical application of stannic selenoiodate

Two new inorganic ion exchangers, stannic selenoiodate and stannic selenosilicate have been synthesized. The ion-exchange capacity of stannic selenoiodate and stannic selenosilicate for K⁺ was found to be 1.84 and 1.23 meq g^–1, respectively. pH titration studies reveal monofunctional and bifunctional behavior for stannic selenosilicate and stannic selenoiodate, respectively. Distribution coefficients of metal ions in dimethylformamide–HCl and formamide–HCl systems have been determined. Some important and analytically difficult quantitative binary and ternary separations, and selective separations of Ag⁺, Sn⁴⁺, Zr⁴⁺, Co²⁺, and Ni²⁺ have been achieved on stannic selenoiodate columns. The practical utility of the material has been demonstrated by analyzing the metal ion content of electroplating waste.