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論文

Analysis of factors contributing to the increase in $$^{7}$$Be activity concentrations in the atmosphere

楢崎 幸範*; 迫田 晃弘; 赤田 尚史*; 伊藤 久徳*; 百島 則幸*

International Journal of Environmental Research and Public Health, 19(16), p.10128_1 - 10128_9, 2022/08

https://doi.org/10.3390/ijerph191610128
 被引用回数：1 パーセンタイル：23.63(Environmental Sciences)

2013年3月、西日本の太宰府市で大気中$$^{7}$$Be濃度の上昇が連日観測された。$$^{7}$$Be濃度の日平均は0.93-14mBq/m$$^{3}$$、月平均は8.3mBq/m$$^{3}$$であった。この月平均値は1999年から2015年にかけて観測された月平均の中で最も高く、この期間の月平均(4.7mBq/m$$^{3}$$)に標準偏差の2倍(1.7$$times$$2mBq/m$$^{3}$$=8.1mBq/m$$^{3}$$)を加えた値よりも高い値であった。また、$$^{7}$$Be生成の要因である宇宙線強度が低い3月(1999-2015年で2013年を除く)のみの月平均値(6.0mBq/m$$^{3}$$)を上回った。後方流跡線解析の結果から、2013年3月に頻発した高緯度での成層圏や対流圏上部からの空気流入が$$^{7}$$Be濃度上昇の原因と考えられた。

論文

Specific cooperative effect of a macrocyclic receptor for metal ion transfer into an ionic liquid

岡村 浩之; 池田 篤史*; 斉藤 拓巳*; 青柳 登; 長縄 弘親; 平山 直紀*; 梅谷 重夫*; 井村 久則*; 下条 晃司郎

Analytical Chemistry, 84(21), p.9332 - 9339, 2012/11

https://doi.org/10.1021/ac302015h
 被引用回数：23 パーセンタイル：62.19(Chemistry, Analytical)

An intramolecular cooperative extraction system for the removal of strontium cations (Sr$$^{2+}$$) from water by use of a novel macrocyclic receptor (H$$_{2}$$$$beta$$DA18C6) composed of diaza-18-crown-6 and two $$beta$$-diketone fragments in ionic liquid (IL) is reported, together with X-ray spectroscopic characterization of the resulting extracted complexes in the IL and chloroform phases. The covalent attachment of two $$beta$$-diketone fragments to a diazacrown ether resulted in a cooperative interaction within the receptor for Sr$$^{2+}$$ transfer, which remarkably enhanced the efficiency of Sr$$^{2+}$$ transfer relative to a mixed $$beta$$-diketone and diazacrown system. The intramolecular cooperative effect was observed only in the IL extraction system, providing a 500-fold increase in extraction performance for Sr$$^{2+}$$ over chloroform. Slope analysis and potentiometric titration confirmed that identical extraction mechanisms operated in both the IL and chloroform systems. Extended X-ray absorption fine structure spectroscopy revealed that the average distance between Sr$$^{2+}$$ and O atoms in the Sr$$^{2+}$$ complex was shorter in IL than in chloroform. Consequently, Sr$$^{2+}$$ was held by H$$_{2}$$$$beta$$DA18C6 more rigidly in IL than in chloroform, representing an important factor dominating the magnitude of the intramolecular cooperative effect of H$$_{2}$$$$beta$$DA18C6 for Sr$$^{2+}$$.

論文

Laser-induced fluorescence and infrared spectroscopic studies on the specific solvation of tris(1-(2-thienyl)-4,4,4-trifluoro-1,3-butanedionato)europium(III) in an ionic liquid

岡村 浩之; 坂江 広基*; 木谷 径治*; 平山 直紀*; 青柳 登; 斎藤 拓巳*; 下条 晃司郎; 長縄 弘親; 井村 久則*

Polyhedron, 31(1), p.748 - 753, 2012/01

https://doi.org/10.1016/j.poly.2011.10.031
 被引用回数：29 パーセンタイル：88.00(Chemistry, Inorganic & Nuclear)

The extraction constant and the two-phase stability constant of tris(2-thenoyltrifluoroacetonato) europium(III) between 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C$$_{4}$$mim][Tf$$_{2}$$N]) as an ionic liquid and an aqueous phase were determined by considering the extraction equilibria. Specific solute-solvent interactions between the neutral Eu(III) chelate and [C$$_{4}$$mim][Tf$$_{2}$$N] molecules were revealed from the relationships between the distribution constant of the enol form of 2-thenoyltrifluoroacetone (Htta) and the distribution constant ($$K$$$$_{rm D,M}$$) of the neutral Eu(III) chelate. The coordination environment of Eu$$^{3+}$$ in the neutral Eu(III) chelate in [C$$_{4}$$mim][Tf$$_{2}$$N] was investigated by time-resolved laser-induced fluorescence spectroscopy and infrared absorption spectroscopy. Both methods consistently indicated that not only the Eu(III)chelate extracted but also Eu(tta)$$_{3}$$(H$$_{2}$$O)$$_{3}$$ synthesized as a solid crystal were almost completely dehydrated in [C$$_{4}$$mim][Tf$$_{2}$$N] saturated with water. Consequently, the higher $$K$$$$_{rm D,M}$$ or extractability of the neutral Eu(III) chelate in the [C$$_{4}$$mim][Tf$$_{2}$$N] system can be ascribed to the dehydration of the Eu(III) chelate, which is caused by the specific solvation with [C$$_{4}$$mim][Tf$$_{2}$$N] molecules.

論文

Progress in development of the advanced Thomson scattering diagnostics

波多江 仰紀; Howard, J.*; 海老塚 昇*; 吉田 英次*; 中塚 正大*; 藤田 尚徳*; 成原 一途*; 山田 一博*; 舟場 久芳*; 平野 洋一*; et al.

Journal of Physics; Conference Series, 227, p.012002_1 - 012002_6, 2010/06

https://doi.org/10.1088/1742-6596/227/1/012002
 被引用回数：2 パーセンタイル：66.71(Physics, Applied)

We have developed new technologies for an advanced Thomson scattering diagnostics to meet various requirements for understanding physical phenomena in fusion plasmas. These technologies for the advanced Thomson scattering diagnostics may contribute future Thomson scattering diagnostics. For example, a polarization interferometer is applicable for T$$_{e}$$ measurement with wide range and imaging measurement. A multipass Thomson scattering and high average power laser employing SBS-PCM may improve the S/N ratio and repetition rate for the measurement, and allows measurement with high spatial resolution. An SBS-PC is a promising technology for LIDAR to generate short laser pulse. A Cr, Nd:YAG will be used for high-efficiency and high average power laser system. Fully relativistic formulae will contribute to the spectrum analysis with wide Te range. A guideline to optimize wavelength channels will be useful for a design of spectrometer.

論文

Changes of physical and mechanical properties of graphites in the Tokai Nuclear Power Station

佐藤 千之助; Ito, Hisanori*; Honda, Toshio*; 吉田 浩; 大道 敏彦; Matsuo, Hideto*; Fukuda, Yasumasa*

Proceedings of the twelfth Japan congress on materials research, p.195 - 200, 1969/00

抄録なし

口頭

Effective extraction of strontium(II) into an ionic liquid by cooperative intramolecular interaction

岡村 浩之; 下条 晃司郎; 池田 篤史*; 斎藤 拓巳*; 青柳 登; 平山 直紀*; 梅谷 重夫*; 井村 久則*; 長縄 弘親

no journal, , 

We recently reported that diaza-18-crown-6 bearing two $$beta$$-diketone fragments (H2$$beta$$DA18C6) provides a considerably high extractability of Sr$$^{2+}$$ due to a cooperative intramolecular interaction in the ionic liquid (IL) extraction system. In the present study, we have investigated the extraction capability of H2$$beta$$DA18C6 for Sr$$^{2+}$$ into 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C$$_{2}$$mim][Tf$$_{2}$$N]) and chloroform in detail. From the p$${it K}$$$$_{a}$$ measurements and the slope analysis, the transfer of Sr$$^{2+}$$ with H2$$beta$$DA18C6 into [C$$_{2}$$mim][Tf$$_{2}$$N] proceeds via a proton exchange reaction, which is identical to the extraction mechanism in the chloroform system. The superior extraction performance in the IL system is not attributed to the difference in the extraction mechanism between IL and chloroform systems. Extended X-ray absorption fine structure measurements showed that the Sr coordination environment of the Sr$$^{2+}$$-$$beta$$DA18C6 complex in [C$$_{2}$$mim][Tf$$_{2}$$N] is similar to that in chloroform. However, the distance between Sr$$^{2+}$$ and O atom in the Sr$$^{2+}$$-$$beta$$DA18C6 complex in [C$$_{2}$$mim][Tf$$_{2}$$N] was shorter than that in chloroform. This result reveals that the shortening of the distance causes remarkably high extractability of Sr$$^{2+}$$, and is ascribable to the cooperative intramolecular interaction of this ligand in IL.

口頭

$$beta$$-ジケトン結合クラウンエーテルを用いたイオン液体抽出系における分子内協同効果の発現

下条 晃司郎; 岡村 浩之; 池田 篤史; 斉藤 拓巳*; 平山 直紀*; 梅谷 重夫*; 井村 久則*; 長縄 弘親

no journal, , 

本研究では、$$beta$$-ジケトン部位を2つ有するクラウンエーテル(H2$$beta$$DA18C6)を新規に合成し、イオン液体及びクロロホルムへのストロンチウムイオン(Sr$$^{2+}$$)の抽出挙動について検討した。また、$$beta$$-ジケトン(HPMBP)単独系,ジベンジルジアザクラウンエーテル(DBzDA18C6)単独系及び両者を混合させた系においても同様に検討を行い、配位子の性能評価を行った。クロロホルムを用いた場合HPMBP単独系及びDBzDA18C6単独系ではSr$$^{2+}$$の抽出は起こらないが、両者を混合した場合において協同効果が働き、定量的な抽出が可能となった。またH2$$beta$$DA18C6系においても定量的な抽出が可能であったが、混合系との抽出挙動に大きな違いは見られなかった。一方、イオン液体を用いた場合、HPMBP単独系では抽出が起こらないがDBzDA18C6単独系ではpHの増加とともに抽出が進行した。両者の混合系は、DBzDA18C6単独系と同様の抽出挙動を示したことから、Sr$$^{2+}$$の抽出においてHPMBPは関与していないことが示唆された。しかしH2$$beta$$DA18C6の抽出能は混合系と比較して劇的に向上し、より酸性側でSr$$^{2+}$$の抽出が可能になった。これは、イオン液体系を用いることでH2$$beta$$DA18C6の分子内協同効果が発現し、Sr$$^{2+}$$に対する抽出能が向上したものと考えられる。

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