Partition of Microamounts of Some M2+ Ions During MgSO4.7H2O Crystallization

Abstract

Partition coefficients (D) of trace amounts of Ni²⁺, Co²⁺, Zn²⁺, Cd²⁺, Cu²⁺, Mn²⁺, Ca²⁺, and Fe²⁺ have been determined during crystallization of MgSO₄.7H₂O. Their dependences on the ionic radii of the M²⁺ ions, solubilities and structures of the corresponding sulfates, as well as the abilities of the microcomponents to form solid solutions with MgSO₄.7H₂O have been analysed. The D values are in the range from <0·005 (D_Ca) to 1·13 (D_Ni) and depend mainly on the ionic radii of the M²⁺ ions, as well as the structures of the corresponding sulfates and the ability to form solid solutions with the macrocomponent.