Anion exchange separation of hard acid-metals using HF-H3BO3 media.

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概要

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• The properties of HF–H<SUB>3</SUB>BO<SUB>3</SUB> media and the distribution coefficients of eighteen metals have been investigated to achieve the separation of hard acid-metals by the anion exchange method. As the addition of boric acid to hydrofluoric acid solution reduces the free fluoride ion concentration to about one hundredth, it is possible to control the formation of metal fluoride complexes in a way favorable for the separation. The BF<SUB>4</SUB><SUP>−</SUP> and BF<SUB>3</SUB>OH<SUP>−</SUP> produced in this media are adsorbed strongly to the resin and reduce the relative adsorbabilities of metal fluoride complexes remarkably. Using these properties of HF–H<SUB>3</SUB>BO<SUB>3</SUB> media and the adsorbabilities of other anions, a new anion exchange method for the separation of hard acid-metals has been proposed. The new method is especially useful for the separation of titanium, zirconium, niobium, and tantalum. Distribution coefficients and elution behaviors of metal ions are not affected by the increase of the amount of metals because of the buffer action relating to the fluoride in HF–H<SUB>3</SUB>BO<SUB>3</SUB> media.

• 公益社団法人 日本化学会の論文

著者

• Adachi Takeo

  Analytical Chemistry Laboratory, Japan Atomic Energy Research Institute

関連論文

• Cation exchange separation of metal ions using HF-H3BO3 media.
• Anion exchange separation of hard acid-metals using HF-H3BO3 media.

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