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Adsorption behavior of $$^{95}$$Nb and $$^{179}$$Ta as homologues of element 105, Db, on cation exchanger in HF/HNO$$_{3}$$ solution

105番元素Dbに向けたHF/HNO$$_{3}$$溶液中における$$^{95}$$Nbと$$^{179}$$Taの陽イオン交換樹脂への吸着挙動

笠松 良崇*; 豊嶋 厚史; 當銘 勇人*; 塚田 和明; 浅井 雅人; 羽場 宏光*; 永目 諭一郎

Kasamatsu, Yoshitaka*; Toyoshima, Atsushi; Tome, Hayato*; Tsukada, Kazuaki; Asai, Masato; Haba, Hiromitsu*; Nagame, Yuichiro

105番元素ドブニウム(Db)のモデル実験として、周期表5族元素であるNbとTaの陽イオン交換樹脂に対する吸着挙動をHFとHNO$$_{3}$$の混合水溶液中において調べた。陽イオン交換樹脂中におけるこれらの元素の化学反応は平衡に即座に到達した。NbとTaの分配係数は本研究で調べたふっ化物イオン濃度範囲(10$$^{-7}$$-10$$^{-5}$$M)において、そのイオン濃度の増加とともに減少することを見いだした。NbとTaの分配係数の変化ははっきりと異なっており、この違いは異なるふっ化物錯体の形成によると考えられる。本実験結果に基づき、Dbのふっ化物錯体形成を明らかにするための陽イオン交換実験を提案する。

Adsorption behavior of the group-5 elements, $$^{95}$$Nb and $$^{179}$$Ta, on cation-exchange resin was studied in mixed solution of HF and HNO$$_{3}$$ as a model experiment of their heavier homologue, element 105 (dubnium, Db). Chemical reactions of these elements in the cation exchange rapidly reached the equilibrium. It was found that distribution coefficients of Nb and Ta decrease with increasing the fluoride ion concentration in the studied range of 10$$^{-7}$$ - 10$$^{-5}$$ M. Clear difference between Nb and Ta was observed in the variations of the distribution coefficients against the fluoride ion concentration. This would originate from their different chemical species of fluoride complexes. We propose the cation-exchange experiment of Db based on the present experimental results to understand its fluoride complex formation.

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