Some Factors Influencing Distribution Coefficients of Trace Amounts of M2+ Ions During the Crystallization of Mn(CH3COO)2·4H2O
Abstract
Distribution coefficients,D2/1 (Henderson – Kracek, Khlopin) of trace amounts of Ni2+,Mg2+, Cu2+, Co2+, Zn2+, Cd2+, Ca2+, and Sr2+ have been determined during the crystallization of Mn(CH3COO)2·4H2O. Their dependencies on several properties of co-crystallizing acetate hydrates M(CH3COO)2·nH2O as well as co-crystallizing M2+ ions have been analyzed. The D2/1 values fall in the range from 0.011 (DCu) to 0.28 (DCo) and indicate the possibility of effective removal of trace amounts of most investigated ions during the crystallization of Mn(CH3COO)2·4H2O at 25 °C. They generally do not depend directly on most investigated factors, but those of Mg2+, Ni2+ and Co2+ ions, which form acetate tetrahydrates like Mn(CH3COO)2·4H2O, closely depend on electronegativity of the elements as well as solubility and η parameter and may be estimated on the basis of the mentioned properties using simple formulae.
Keywords: Crystallization, manganese(II) acetate tetrahydrate, Henderson-Kracek, Khlopin distribution coefficients, D
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