Adsorption of Iron (III) in Metal Chloride Solutions on the XAD-7 Resin and Its Application to Neutron Activation Analysis

Adsorption of Fe (III) on XAD-7 from LiCl, NaCl, KCl, RbCl, CsCl, CaCl2 and AlCl3 solutions was studied. Fe (III) was quantitatively adsorbed on XAD-7 in high chloride concentrations above 6 M. As an application of such adsorption behavior of Fe (III), determination of trace iron usually present as an impurity in reagent grade metal chlorides was examined. After adsorbing Fe (III) from high chloride concentrations on XAD-7, neutron activation was carried out on the resin. Iron amounts of 0.3 ppm, 1.6 ppm and 1.3 ppm were obtained with LiCl, CaCl2⋅2H2Oand AlCl3⋅6H2O, respectively.