Study the Factors Affecting Cadmium Ions Extraction from Aqueous Two-Phase System Using Potassium Iodide

Abstract

The extraction of Cd (II) was studied in an aqueous PEG-Na2SO 4 two phase system, formed from a water soluble polymer (poly ethylene glycol) and inorganic salt (Na2SO4), in the presence of iodide ions (potassium iodide) as extractant . For the system consisting of mixture of 50 wt% PEG and 15 wt% Na2SO4 aqueous solution , % Cd removed was determined as a function of Initial concentrations of Cd (II) , Concentration of (KI) solvent , Phase ratio (PEG /Na2SO4) , and Molecular weight of the (PEG) polymer .The experimental results measured by atomic absorption spectrometer model (PERKIN – ELMER 5000) and it shows that for a given aqueous two-phase system, the extraction behavior of Cd (II) is increased with increasing of the four variables above.The optimum results for the extraction of Cd (II) determined for mixtures consisting of (0.5ml) of Initial Concentration of Cd(II), (0.28ml) of KI, phase ratio (PEG/Na2SO4) equal to 4 for the molecular weight of PEG (3000, 8000, 20000) g/g mole which reach's to (94, 95, and 97 %) respectively.