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Sgの研究に向けたMo(VI)とW(VI)の溶媒抽出挙動

Extraction behavior of hexavalent Mo and W for Sg experiment

宮下 直; 大江 一弘; 豊嶋 厚史; 佐藤 哲也; 浅井 雅人; 塚田 和明; 永目 諭一郎; Sch$"a$del, M.; 金谷 佑亮*; Omtvedt, J. P.*; Kratz, J. V.*; 羽場 宏光*; 和田 彩佳*; 北山 雄太*

Miyashita, Sunao; Oe, Kazuhiro; Toyoshima, Atsushi; Sato, Tetsuya; Asai, Masato; Tsukada, Kazuaki; Nagame, Yuichiro; Sch$"a$del, M.; Kaneya, Yusuke*; Omtvedt, J. P.*; Kratz, J. V.*; Haba, Hiromitsu*; Wada, Ayaka*; Kitayama, Yuta*

SISAKを利用したSgの実験に適応できる迅速な溶媒抽出を用いた分離法開発を目的に、di(2-ethylhexyl)phosphoric acid (HDEHP), 1-phenyl-3-metyl-4-benzoyl-5-pyra-zolone (PMBP), N-benzoyl-N-phenylhydroxylamine (BPHA)及び4-isopropyltropolone (HT)の4種類の抽出剤を用いて、Sgの同族元素であるMo(VI)とW(VI)を用いた溶媒抽出を行い、その抽出挙動を調べた。$$^{181}$$Wを用いた実験ではHDEHP, PMBPを抽出剤として用いた場合、抽出速度は遅く平衡到達時間はそれぞれ5時間と1時間であった。一方、BPHA及びHTを用いた場合、BPHA, HTどちらの抽出剤においても平衡到達時間は60秒と速い抽出反応であることがわかった。速い抽出反応であったBPHA, HTを用いて$$^{rm 93m}$$Moを対象に抽出実験を行った結果、平衡到達時間はBPHAで10分、HTで3分であり、どちらの抽出剤においてもWと比べ遅い抽出反応であることがわかった。これらの平衡到達時間はSISAKを用いた抽出に適応可能であると考えられる。

For the experiments of the redox potentials of Sg, rapid separation between different oxidation states of Sg is needed. In this study, solvent extraction of hexavalent Mo and W, as the lighter homologues of Sg, from 1.0 mol/L hydrochloric acid solution into di-(2-ethylhexyl)phosphoric acid (HDEHP), 1-phenyl-3-metyl-4-benzoyl-5-pyrazolone (PMBP), N-benzoyl-N-pheny-hydroxylamine (BPHA) and 4-isopropyl-tropolone (HT) in toluene was carried out. When HDEHP and PMBP were used as extractant, extraction equilibrium of $$^{181}$$W was achieved within 5 and 1 hours respectively. On the other hand, when BPHA and HT were used, extraction equilibrium of $$^{181}$$W was quickly achieved within 1 minute in both extractants. Extraction kinetics of $$^{rm 93m}$$Mo using BPHA and HT was examined. Extraction kinetics of Mo was slower than that of W. Extraction equilibrium of Mo was achieved within 10 by BPHA and 3 minutes by HT. We concluded that HT is a suitable extractant for the Sg reduction experiment.

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