Polarographic determination of bismuth, copper, iron(III), palladium, and uranium(VI) after extraction into molten naphthalene with oxine.

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A rapid extraction-polarographic method has been developed for the direct determination of bismuth, copper, iron(III), palladium, and uranium(VI) extracted into the organic phase. Oxinates of metals were extracted into molten naphthalene at different pH values. With lowering of temperature, naphthalene separated out as a solid containing the metal oxinates. The solid mass was dissolved in DMF and the polarograms were recorded in the presence of a suitable supporting electrolyte. The metal oxinates give well defined waves. The relation between diffusion current and concentration is linear over a wide range of concentration with an average relative error not more than 1.05%. Interferences of various ions have been studied of the anions studied, only EDTA interfered in the extraction of bismuth, copper, iron(III), and uranium(VI). Of the cations studied, palladium interfered in the determination of bismuth, copper, iron(III), and uranium(VI). However, the intereference was eliminated by carrying out extraction first at low pH. In the determination of bismuth only copper interfered but its interference can also be eliminated as in the case of palladium. In the case of copper determination, only iron(III) interfered. In the determination of iron, copper interfered but interference can be eliminated by using a suitable masking agent. The determination of palladium and uranium(VI) is free from all interferences.
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