金属ウラン中の亜鉛の定量法

概要

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For determination of zinc in metallic uranium by the dithizone extraction method, the effect of pH on the extraction of zinc-dithizone complex, the concentration of dithizone, and the liberating agent for elusion of adsorbed dithizone complex from alumina column have been investigated and tha following method of determination was established.<BR>The sample was dissolved in hydrochloric acid and hydrogen peroxide, it was evaporated to dryness, the residue was treated with ammonium citrate for masking of uranium, aqueous ammonia was added to adjust pH 8.5±0.3, and zinc was extracted as dithizone complex into carbon tetrachloride.<BR>The extracted solution was passed through an alumina adsorption column, washed with chloroform for removing of dithizone complexes of nickel and cobalt, the zinc was liberated by use of chloroform-methanol and determined by measuring the light absorbance at 480mμ. Determination of 0.28γ of Zn/5m<I>l</I>. was made by the proposed method.
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