Extraction behaviour of metal ions in aqueous polyethylene glycol–sodium sulphate two-phase systems in the presence of iodide and thiocyanate ions

The distribution behaviour of Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Li(I) was studied in an aqueous two-phase system formed from a polyethylene glycol and sodium sulphate in the presence of thiocyanate or iodide ion. From the distribution ratios determined as a function of the iodide or thiocyanate concentration, the extracted species were assumed. In the SCN − null system Cu(II), Zn(II) and Co(II) distribute into the...