EXTRACTION OF CADMIUM(II)-PHENANTHROLINE COMPLEX ON POLYURETHANE FOAMUSING DITHIZONE AS COUNTERION FOR ITS SPECTROPHOTOMETRIC DETERMINATION IN COMMERCIAL ZINC-OXIDES

A spectrophotometric method for the determination of Cd-II in low conc entration upto 0.05 mu g ml(-1) after selective extraction of Cd-II. p henanthroline complex on polyurethane foam sorbents using dithizone as counter-ion has been developed. interferences of metal ions such as M n-II, Ni-II, Co-II, Fe-II upto 100 mu g, Zn-II upto 8000 mu g and Pb-I I upto 1000 mu g have automatically been clinlinated in the presence o f 1,10-phenanthroline. Cu-II (50 mu g) interferes in the determination of Cd (20 mu g) which has been eliminated by masking with EDTA. F- io n does not interfere in the method. The method Iras been applied to va rious Zn-bearing materials.