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論文

Studies on the uptake and column chromatographyic separation of Eu, Th, U, and Am by tetramethylmalonamide resin

島田 亜佐子; Sulakova, J.*; Yang, Y.*; Alexandratos, S.*; Nash, K. L.*

Solvent Extraction and Ion Exchange, 32(1), p.27 - 43, 2014/01

https://doi.org/10.1080/07366299.2013.838492
 被引用回数：4 パーセンタイル：16.82(Chemistry, Multidisciplinary)

3, 4, 6価のアクチニドの分離のためにテトラメチルマロンアミド(TMMA)を修飾した樹脂を開発し、研究した。基礎研究として、Eu(III), Th(IV), U(VI), Am(III)のHNO$$_{3}$$, NaNO$$_{3}$$, HCl, NaCl溶液からのTMMA樹脂への質量分配係数($$K$$$$_{d}$$)を取得した。また、HNO$$_{3}$$の樹脂への分配についても評価した。試験を行ったすべての溶液において$$K$$$$_{d}$$の順番はTh$$>$$U$$>$$Am=Euであった。金属とHNO$$_{3}$$の抽出の競争について抽出データとFT-IRにより確認した。EuとUの3M HNO$$_{3}$$からの負荷容量は0.83mmol/gと1.6mmol/gであり、推定される金属:TMMA化学量論はEuに対して1:2、Uに対して1:1であった。溶離剤の開発のために数種類の有機酸がThとUの$$K$$$$_{d}$$に与える影響を調べた。また、廃棄物分析において想定されるマトリックス元素であるNaやAl, K, Ca, Cr, Ni, FeなどのAm(III)の$$K$$$$_{d}$$に与える影響についても調べた。それらの結果をもとにクロマトグラフィーのスキームを考案し、分離試験を実施した。

口頭

Extraction properties of tetramethylmalonamide resin for actinide ions

島田 亜佐子; Nash, K.*; Alexandratos, S.*; Yang, Y.*

no journal, , 

The extraction properties of tetramethylmalonamide (TMMA) resin have been studied for the separation of actinides from radioactive waste solutions. High weight distribution ratios (${it D}$w) of Th and U were obtained from HNO$$_{3}$$ and HCl solutions in the concentration range 0.01 to 10 M. ${it D}$w of Am was over 60 from HNO$$_{3}$$ solutions in that concentration range, however, it decreased to 5 from 0.01 to 1 M HCl solutions. The influence of co-existing metal ions on ${it D}$w of Am from 3 M HNO$$_{3}$$ solution was studied. ${it D}$w of Am was decreased with an increasing Fe$$^{3+}$$ concentration due to the competition. On the other hand, ${it D}$w of Am was slightly increased in the presence of Ni$$^{2+}$$. In order to evaluate stripping agent, the influence of some organic acids and chelate agents on ${it D}$w of Th and U were investigated.

口頭

Fundamental investigation of extraction properties of actinides elements with tetramethylmalonamide resin

島田 亜佐子; Nash, K.*; Alexandratos, S.*; Yang, Y.*

no journal, , 

For the disposal of low-level radioactive waste (LLW) in a near surface repository, evaluation of its radioactive inventory is required. Since the amount of alpha-emitting nuclides is much lower than the matrix elements in LLW, chemical separation is necessary for analysis of alpha emitting nuclides. In this study, the extraction properties of tetramethylmalonamide (TMMA) resin for alpha-emitting nuclides are reported. TMMA resin strongly extracts tracer amount of Th and U from HNO$$_{3}$$ and HCl solutions in the concentration range from 0.01 to 10 mol/dm$$^{3}$$ with the extraction equilibrium being reached within 1 hour. The extraction of Am with TMMA is lower than those of U and Th, and it takes approximately 3 hour to reach equilibrium. The effect of co-existing nuclides on Am extraction with TMMA is also studied. At [Fe$$^{3+}$$] above 0.01 mol/dm$$^{3}$$, the extraction of Am was decreased. In contrast, Am extraction is slightly increased in the presence of Ni$$^{2+}$$.

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