RESEARCH ARTICLE

Some factors influencing distribution coefficients of trace amounts of M²+ ions during the crystallization of Mn(CH₃COO)₂•4H₂O

Marek Smolik^*; Lukasz Siepietowski

Department of Chemistry, Inorganic Technology and Fuel, Silesian University of Technology, Gliwice, Poland

ABSTRACT

Distribution coefficients, D_2/1 (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 D_2/1 values fall in the range from 0.011 (D_Cu) to 0.28 (D_Co) 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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Received 14 January 2011
Revised 3 March 2011
Accepted 9 March 2011

* To whom correspondence should be addressed. E-mail: marek.smolik@polsl.pl