検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Influence of hydrofluoric acid on extraction of thorium using a commercially available extraction chromatographic resin

抽出クロマト樹脂を用いたTh抽出へのHFの影響

藤原 亜佐子; 星 亜紀子; 亀尾 裕; 中島 幹雄

Fujiwara, Asako; Hoshi, Akiko; Kameo, Yutaka; Nakashima, Mikio

UTEVAレジンにより1$$times$$10$$^{-6}$$mol/dm$$^{3}$$のThとさまざまな濃度のHFを含む硝酸溶液(1$$sim$$5mol/dm$$^{3}$$)からThを回収するとき、Th回収率のHF濃度依存性を調べた。Th回収率はHF濃度の増加とともに減少した。ほぼ100%の回収率が得られる最大のHF濃度は、1mol/dm$$^{3}$$硝酸では約10$$^{-4}$$mol/dm$$^{3}$$, 3mol/dm$$^{3}$$硝酸では約10$$^{-3}$$mol/dm$$^{3}$$, 5mol/dm$$^{3}$$では約10$$^{-2}$$mol/dm$$^{3}$$であった。0.1mol/dm$$^{3}$$のHFを含む溶液に硝酸アルミニウム(0.2mol/dm$$^{3}$$)又は硝酸鉄(0.6mol/dm$$^{3}$$)をF$$^{-}$$のマスキング剤として添加するとTh回収率は1.4$$pm$$0.3%から95$$pm$$5%又は93$$pm$$3%に改善された。UTEVAレジンによるThの効果的な抽出は、試料溶液中のHF濃度に応じて硝酸濃度を選択することや硝酸アルミニウムのようなマスキング剤を添加することにより達成できる。

Dependence of Th recovery on HF concentration in nitric acid solutions (1$$sim$$5 mol/dm$$^{3}$$) containing 1$$times$$10$$^{-6}$$ mol/dm$$^{3}$$ of Th and various concentrations of HF was studied using a commercially available UTEVA resin column (for uranium and tetravalent actinide). Thorium recovery decreased with an increase in the HF concentration in the sample solutions. The concentration of HF at which Th recovery started to decrease was about 1$$times$$10$$^{-4}$$ mol/dm$$^{3}$$ in 1 mol/dm$$^{3}$$ HNO$$_{3}$$ solution, about 1$$times$$10$$^{-3}$$ mol/dm$$^{3}$$ in 3 mol/dm$$^{3}$$ HNO$$_{3}$$ solution, and about 1$$times$$10$$^{-2}$$ mol/dm$$^{3}$$ in 5 mol/dm$$^{3}$$ HNO$$_{3}$$ solution. When Al(NO$$_{3}$$)$$_{3}$$ (0.2 mol/dm$$^{3}$$) or Fe(NO$$_{3}$$)$$_{3}$$ (0.6 mol/dm$$^{3}$$) was added as a masking agent for F$$^{-}$$ into the Th solution containing 1$$times$$10$$^{-1}$$ mol/dm$$^{3}$$ HF and 1 mol/dm$$^{3}$$ HNO$$_{3}$$, the Th recovery improved from 1.4$$pm$$0.3% to 95$$pm$$5% or 93$$pm$$3%. Effective extraction of Th on UTEVA resin was achieved by selecting the concentration of HNO$$_{3}$$ and/or adding masking agents such as Al(NO$$_{3}$$)$$_{3}$$ according to the concentration of HF in the sample solution.

Access

:

- Accesses

InCites™

:

パーセンタイル:69.86

分野:Biochemical Research Methods

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.