105番元素(Db)の化学的研究を目指したNb, Ta, PaのHF/HNO溶液系における陰イオン交換実験

Anion-exchange behavior of Nb, Ta and Pa in HF/HNO media for chemical investigation of Db

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

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

105番元素、ドブニウムの化学的研究を行うために、HF/HNO水溶液中におけるNb, Ta, Paの陰イオン交換挙動を詳細に調べた。その結果から各元素の溶存状態を考察し、それぞれの元素が異なった状態で存在していることを示すことができた。平衡到達時間の観測結果と併せて、Dbを対象とした迅速オンライン実験の条件を決定した。

Anion-exchange behavior of Nb, Ta and Pa in HF/HNO media was investigated in order to find suitable experimental conditions for the study of Db fluoride complex formation. Distribution ratios of the elements on strongly basic anion exchangers were measured in the wide range of the fluoride ion concentration. We discuss the formation of anionic fluoride complexes of the elements on the basis of the variations of the distribution ratios against [F] and [NO]. Based on these results together with the results of the kinetic studies, we propose rapid online experimental conditions for the chromatographic study of Db.