EFFECT OF SULPHATE ION CONCENTRATION ON NICKEL (II) EXTRACTIONS FROM AQUEOUS SOLUTION USING 1-PHENYL-3-METHYL-4-TRICHLOROACETYL PYRAZOL-5-ONE IN CHLOROFORM

A. Sangoremi, Jackson Godwin, B. A. Uzoukwu

Abstract


The extraction of Ni2+ from aqueous solutions of various concentrations of SO42- ions in buffered media using 1-phenyl-3-methyl-4-trichloroacetyl-pyrazolone-5 (HTCP) has been investigated. The synergistic effect of butanol on the extraction of the metal was also examined. Ni2+ was quantitatively extracted from solutions of HTCP only at high pH values (5 - 8) over the pH range 0 – 8 studied. However, addition of butanol resulted in a synergistic extraction of Ni2+ up to 97.78% over the range of pH 5.00 – 8.00 from aqueous buffer media containing 0.1M SO42- ion concentration. Increased SO42- ion concentration resulted in a slight decrease in the extraction of Ni2+ ion due to masking of the  metal by the SO42- ion. In addition, overall extraction was shifted to higher pH values for extraction into chloroform solution of the ligand for Ni2+ using butanol. The log Kex and pH1/2 of the various extraction systems were determined.

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DOI: http://dx.doi.org/10.17628/ecb.2013.2.68-71

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