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South African Journal of Chemistry

versão On-line ISSN 1996-840X
versão impressa ISSN 0379-4350

Resumo

SMOLIK, Marek  e  SIEPIETOWSKI, Lukasz. Some factors influencing distribution coefficients of trace amounts of M2+ ions during the crystallization of Mn(CH3COO)24H2O. S.Afr.j.chem. (Online) [online]. 2011, vol.64, pp.34-37. ISSN 1996-840X.

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.

Palavras-chave : Crystallization; manganese(II) acetate tetrahydrate; Henderson-Kracek; Khlopin distribution coefficients, D.

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