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엘루션크로마토그래피에 의한 리튬동위원소의 농축

The Enrichment of Lithium Isotopes by Elution Chromatography

HWAHAK KONGHAK, December 1988, 26(6), 571-582(12), NONE
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Abstract

강산성 양이온 교환수지, Dowex 50w-x8, 200-400mesh를 사용하여 리튬동위원소를 분리하였다. 리튬동위원소의 분리인자의 값은 eluent의 pH와는 무관하고, 분포계수의 증가에 따라 증가하였다. 분포계수의 값이 약 30까지는 분리인자의 값이 급격히 증가하였으나, 그 이상에서는 점근적으로 증가하였다. 그리고 동일한 분포계수하에서 eluent 종의 coordination site 수가 증가함에 따라, 분리인자의 값이 증가하였다. 또한 같은 분포계수하에서는, eluting cation의 하전수가 증가함에 따라 분리인자의 값이 증가하였다. 7Li+은 액체상에 농축되었고, 6Li+은 수지상에 농축되었다.
Elution chromatography with Dowex 50w-x8, 200-400 mesh, strongly acidic cation exchanger was used for the separation of lithium isotopes. The separation factor, α was increased with increasing distribution coefficient, Kd, and not dependent on the pH of eluents. And the optimum value of distribution coefficient to separate lithium isotopes was about 30. At the same distribution coefficient, the separation factor was increased with the number of coordination site of eluents, or charge number of eluting cations. 7Li+ was concentrated in the liquid phase and 6Li+ in the resin phase.

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