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South African Journal of Chemistry

On-line version ISSN 1996-840X
Print version ISSN 0379-4350

S.Afr.j.chem. (Online) vol.64  Durban  2011

 

RESEARCH ARTICLE

 

Some factors influencing distribution coefficients of trace amounts of M2+ ions during the crystallization of Mn(CH3COO)24H2O

 

 

Marek Smolik*; Lukasz Siepietowski

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

 

 


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)24H2O. Their dependencies on several properties of co-crystallizing acetate hydrates M(CH3COO)2nH2O 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)24H2O 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)24H2O, 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


 

 

Full text available only in pdf format.

 

 

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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

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