イオン交換樹脂によるルビジウムとセシウムの分離

概要

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Ion exchange separation of Rb and Cs was studied by the batch and the column methods using 86Rb and 137Cs as radioactive tracers. The cation exchanger Diaion SK #1 was chosen, and 0.5N, 0.75N HCl were used for the eluant. The distribution coefficients Kd were determined by the batch method. The apparent Kd were invariable when Rb or Cs carrier increased from trace quantities to about 5 mg, and decreased thereafter. The separation factors α also were determined by the batch method. Their values of KdRb KdCs and α were 43.0, 56.6 and 1.32 in the 0.5N HCl, and were 25.9, 33.5 and 1.29 in the 0.75N HCl respectively. The elution curves were taken for Rb and Cs by the column method. The distribution coefficients Kd and separation factors α calculated from the column experiments coincided with those by the batch method. Also 0.15N NH4 acetate solution was used to elute Rb and Cs, but the separation was less effective than the elution by HCl. At last 0.1N Ba(OH)2 solution was used for the treatment of a large amount of material, and about 300 mg crude Rb (containing Cs) was purified experimentally.
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