Author： Uzoukwu B. A. Ekeka V. C. Ayozie C. Onwuatu J. O.
Publisher： Taylor & Francis Ltd
ISSN： 0736-6299
Source： Solvent Extraction and Ion Exchange, Vol.30, Iss.5, 2012-08, pp. : 480-489
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Abstract
The effect of sulphate ions in a buffered medium on the extraction of manganese(II) (Mn(II)) into 1-phenyl-3-methyl-4-butyryl-pyrazolone-5 (HBuP) in chloroform and benzene solutions has been studied. It showed that extraction at lower pH values is more favorable with solvents that have lower dielectric constants. It is also shown that an increase in sulphate ion concentration in the buffered medium leads to a decrease in Mn(II) extraction and a shift of the extraction process to higher pH values. Slight synergism occurred in the distribution of the metal ion into the benzene-butanol phase and data showed that pH½ was further shifted to lower values on the addition of butanol into either of the organic phases studied. The slope analysis indicated that Mn(BuP)2 species were extracted during all the extraction processes. The extraction patterns from solutions of mineral acids, salting out, and auxiliary complexing agents were reported. The pH½, log KD, and log Kex of all the extraction systems were determined and used for explaining the various extraction processes observed.
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