The Chemistry of Americium. II. The Behavior of Am(III), Am(V), and Am(VI) in Column Chromatography, with Bis(2-ethylhexyl)phosphoric Acid Used as the Extractant

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概要

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• The behavior of Am(III), Am(V), and Am(VI) in column chromatography with bis(2-ethylhexyl)phosphoric acid(HDEHP) used as the extractant were investigated in comparison with that of Np(IV), Np(V), and Np(VI). When the solution of Am(VI) was submitted to the column chromatography, it was found that Am(VI) was rapidly reduced to Am(V) and partially to Am(III) by HDEHP, irrespective of the conditions, such as the flow rate, the acidity, and the composition and temperature of the influent. The optimum conditions for the separation of Am(V) and Am(III) and for the preparation of the Am(V) solution were established by utilizing the difference in the adsorbability on the column bed between Am(III) and Am(V). When a freshly-prepared Am(V) solution was submitted to column chromatography, it was found that Am(V) was also reduced to Am(III) as well as Am(VI) by HDEHP. The percentage of the Am(V) fraction eluted strongly depended on the conditions in the column chromatography, but it was found to be constant within the limits of experimental error under definite conditions as long as the same column was used. This fact was applied to the determination of the Am(V) content in the mixed solution of Am(III) and Am(V). The content of Am(V) decreased slowly in the nitrate, acetate, sulfate, and perchlorate solutions at lower temperatures, but it rapidly decreased in the chloride, iodide, sulfite, and hydrogen peroxide solutions even at 0 °C. The content of Am(V) decreased more rapidly at higher temperatures, and the kinetic analysis showed that the reduction of Am(V) apparently followed the first-order kinetics in the acetate solutions.

• 公益社団法人 日本化学会の論文

著者

• Hara Mitsuo

  The Research Institute For Iron Steel And Other Metals

• Suzuki Shin

  The Research Institute For Iron Steel And Other Metals

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