Abstract
An accurate and precise method for the determination of plutonium in nitric acid solutions of irradiated uranium is described. Plutonium IV is extracted using the quaternary amine Hyamine 1622 dissolved in benzene; the benzene is removed by evaporation and, after dissolution of the residue in acetone, an excess of ethylenediaminetetra-acetic acid (EDTA) is added and the uncomplexed EDTA determined by photometric titration using standard zinc chloride solution and dithizone as indicator. The extraction is highly specific for plutonium and a two-stage cycle results in a decontamination factor of approximately 10 5 for mixed fission products and 10 2 for uranium. Under carefully controlled conditions the method yields a standard deviation of 0–4% for 10 2-μg amounts of plutonium.
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