ABSTRACT

Solvent extraction of zinc ion from buffered solutions into acetylacetone and suiphamethoxazole

as a function of pH and concentration of anionic substances and certain mineral acids were

investigated in this work. The various effects of these reagents on Zn(II) ion extraction had been

documented and could be developed as an appropriate means of qualitative and quantitative

extraction and recovery of this metal. Zinc was quantitatively extracted at pH of 7.0 to pH 8.0. The

highest percentage extraction 83.90% was observed at pH 8.0 in a system of acetylacetone and

sulphamethoxazole and metal solution. In this extraction, increase in pH above 8.0 resulted in a

steady decrease in the extraction of Zn(II). All studies on the effect of anions showed significant

extractions and changes in their concentrations affected the percentage extraction. For F-and NO3

ions, increase in their concentration resulted to increase in percentage extraction up to 85.27 %

and 74.6 % respectively at 0.01 M above which percentage extraction declined progressively.

While increase in concentration of S042ions to 0.005 M resulted to the highest percentage

extraction of 81.7% and further increase in the concentration caused a steady decline in percentage

extraction. All studies on mineral acids also showed significant extractions and changes in their

concentrations affected the percentage extraction. Increase in the concentration of H2SO4 and HC1

resulted to decrease in percentage extraction. A high percentage extraction of 83.90 % was

observed at 0.005 M H2SO4 and further increase up to 0.05 M resulted to the least percentage

extraction of 33.20 %., for HC1, 77.60 % occurred at 0.001 M and further increase in its

concentration caused a decrease in percentage extraction up to 0.05 M where the least percentage

extraction occurred. While it was observed that increase in the concentration of HNO3 gave a

positive yield as concentration was increased. The least percentage extraction of 26.83 % occurred

at 0.001 M and further increase in Fll'.T03concentration up to 0.05 M resulted to increased

percentage extraction up to 50.20 %. Generally, the mineral acids gave good extractions but the

anions gave better extractions with F-giving the best extraction of 85.27 % at 0.01 M.