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マイナーアクチノイド及びランタノイドとジチオカーバメイトとの錯形成定数の決定

Stability constants of minor actinides and lanthanides with dithiocarbamate

宮下 直; 北辻 章浩 ; 木村 貴海 

Miyashita, Sunao; Kitatsuji, Yoshihiro; Kimura, Takaumi

硫黄により配位する抽出剤と3価アクチノイド(An$$^{3+}$$)及びランタノイド(Ln$$^{3+}$$)との相互作用をより詳細に理解するため、ジ(2-エチルヘキシル)リン酸(HDEHP)を用いた逆抽出法により、水溶液中におけるアンモニウムピロリジンジチオカーバメイト(APDC)と$$^{241}$$Am, $$^{244}$$Cm及びEuとの錯形成定数を決定した。その結果、平衡時のAPDC濃度の増加に伴い${it D}$ $$_0$$/${it D}$-1は増加し、AmとPDC$$^-$$が強く相互作用していることがわかった。得られた結果より、Amでは錯形成定数($$beta_n$$, ${it n}$=1, 2)はそれぞれlog$$beta_1$$(Am)=2.5$$pm$$0.3, log$$beta_2$$(Am)=4.3$$pm$$0.2となった。

The stability constants of trivalent minor actinides (An$$^{3+}$$; $$^{241}$$Am and $$^{244}$$Cm) and lanthanides (Ln$$^{3+}$$; Eu) with Ammonium pyrrolidinedithiocarbamate (APDC) in aqueous solution were investigated. The stability constants were obtained by back-extraction technique using di(2-ethylhexyl)phosphoric acid (HDEHP) as follows. Aqueous phase was acetic buffer solution from 0.02 to 0.10 mol/cm$$^3$$ containing various concentrations of APDC. Organic phase was toluene or benzene solution containing HDEHP and trace amounts of the extracted radionuclide such as $$^{241}$$Am or $$^{244}$$Cm. Eqvolumes of the aqueous phase and the organic phase were mixed in vial and were shaken 30 minutes at 298 ${it K}$. The results show that minor actinides strongly interacted with dithiocarbamate. From those results, the obtained stability constants ($$ beta_n$$, ${it n}$ = 1, 2) for Am are log$$ beta_1$$(Am) = 2.5 $$pm$$ 0.3, log$$ beta_2$$(Am) = 4.3 $$pm$$ 0.2 at 298 ${it K}$.

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