On the extraction and separation of iodide complex of cadmium(II)in propyl-alcohol ammonium sulfate aqueous biphasic system

摘要

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 NH4I and HC1 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-)centre dot(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.