Prediction of Ksp sequence for some sparingly soluble salts from Kd values of metal ions on some inorganic ion exchangers based on tin and silicon- A new approach

摘要

The distribution coefficients of twelve heavy metal ions such as Cu2+, Mn2+, Pb2+, Hg2+ etc. have been determined on various ion exchange adsorbents based on Silicon and Tin. The materials used have been Stannic arsenosilicate, Stannic tungstosilicate, Stannic molybdosilicate, Stannic phosphorsilicate, Stannic selenosilicate and Stannic antimonysilicate. These double salts possess adsorption ion exchange properties and have been found to be selective for one or more metal ions. On the basis of the adsorption behaviour for metal ions, the Ksp sequence of various double salts with heavy metal ions have been predicted. A number of analytically useful separations including Cu2+-Hg2+, Cu2+-Ni2+, Pb2+-Al3+, Zn2+-Mn2+, Pb2+-Zn2+, Cu2+-Zn2+, Cu2+-Al3+, Cu2+-Mn2+ etc., have also been achieved on these materials by the column chromatographic method.