Abstract
The distribution behavior of iodide complex of Cd(II) in the propyl-alcohol ammonium sulfate aqueous biphasic extraction systems was experimentally investigated in this study. In the presence of NH 4I and HCl medium, Cd(II) was found to be extracted into the propyl-alcohol phase as a result of the formation of ion pair [CdI 4 2−·(PrOH 2 +) 2]. The experimental results indicated that cadmium can be quantitatively extracted by the proposed method, and an extraction percentage of 99.2% can be achieved under the suggested optimal extraction conditions. The potential applications of the proposed method to the separation of cadmium from base metals, such as Fe 2+, Ca 2+, Mg 2+, Mn 2+, Al 3+, Pb 2+ and Zn 2+ in synthetic samples, and to the separation of cadmium from Cd contaminated soils were also investigated in this work.
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