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on Na-montmorillonite studied by time-resolved laser fluorescence spectroscopy and surface complexation modelingSasaki, Takayuki*; Ueda, Kenyo*; Saito, Takumi; Aoyagi, Noboru; Kobayashi, Taishi*; Takagi, Ikuji*; Kimura, Takaumi; Tachi, Yukio
Journal of Nuclear Science and Technology, 53(4), p.592 - 601, 2016/04
Times Cited Count：12 Percentile：74.83(Nuclear Science & Technology)The influences of pH and the concentrations of Eu and NaNO
on the sorption of Eu to Na-montmorillonite were investigated through batch sorption measurements and time-resolved laser fluorescence spectroscopy (TRLFS). The pH had a little effect on the distribution coefficients (Kd) in 0.01 M NaNO, whereas the Kd strongly depended on pH at 1 M NaNO. A cation exchange model combined with a one-site non-electrostatic surface complexation model was successfully applied to the measured Kd. The TRLFS spectra of Eu sorbed were processed by parallel factor analysis (PARAFAC), which corresponded to one outer-sphere (factor A) and two inner-sphere (factor B and C) complexes. It turned out that factors A and B correspond to Eu sorbed by ion exchange sites and inner-sphere complexation with hydroxyl groups of the edge faces, respectively. Factor C became dominant at relatively high pH and ionic strength and likely correspond to the precipitation of Eu(OH) on the surface.
Ueda, Yoshio*; Oya, Kaoru*; Ashikawa, Naoko*; Ito, Atsushi*; Ono, Tadayoshi*; Kato, Daiji*; Kawashima, Hisato; Kawamura, Gakushi*; Kenmotsu, Takahiro*; Saito, Seiki*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 88(9), p.484 - 502, 2012/09
no abstracts in English
Sasaki, Takayuki*; Yoshida, Hatsumi*; Kitatsuji, Yoshihiro; Takagi, Ikuji*; Moriyama, Hirotake*
Chemistry Letters, 40(8), p.870 - 871, 2011/08
Times Cited Count：1 Percentile：6.74(Chemistry, Multidisciplinary)Trivalent metal ion selective electrode (ISE) consisting of bis-(diphenylphosphoryl)-methane as an ionophore was developed for the determination of formation constants with organic ligands. The ISE prepared exhibited Nernstian response to the concentration of Eu in the test solutions. Even in the presence of carboxylic acids such as malonic acid in samples, the obtained potential values were found to be stable and reproducible during the measurement time. The present formation constants of Eu with carboxylates were in good agreement with the reported values.
Ueda, Yoshio*; Hino, Tomoaki*; Ono, Noriyasu*; Takagi, Ikuji*; Nakano, Tomohide; Tanabe, Tetsuo*; Kajita, Shin*; Fukumoto, Masakatsu
Purazuma, Kaku Yugo Gakkai-Shi, 85(10), p.684 - 694, 2009/10
Relation between deuterium retention, wall temperature and hydrocarbon generation in 30-s H-mode discharges of JT-60U was described. In discharges with a density below 50% of the Greenwald density, the trend of the deuterium retention against pulse number depended on the wall temperature: with increasing pulse number, the deuterium retention decreased at a wall temperature of 300 
C, decreased gradually at 150 C, and remained constant at 80 C. In contrast, in discharges with high densities above 70% of the Greenwald density, the deuterium retention increased with increasing pulse number at the above three wall temperatures. In the high density discharges, the deuterium retention flux increased with increasing hydrocarbon generation flux, suggesting that the deuterium is retained in co-deposition layers of carbon, which originated from the hydrocarbons.
Nakamichi, Masaru; Nakamura, Hirofumi; Hayashi, Kimio; Takagi, Ikuji*
Journal of Nuclear Materials, 386-388, p.692 - 695, 2009/04
Times Cited Count：10 Percentile：56.67(Materials Science, Multidisciplinary)no abstracts in English
Takagi, Ikuji*; Kobayashi, Takashi*; Ueyama, Yutaka*; Moriyama, Hirotake*; Nakamichi, Masaru; Nakamura, Hirofumi; Hayashi, Kimio
Journal of Nuclear Materials, 386-388, p.682 - 684, 2009/04
Times Cited Count：8 Percentile：49.52(Materials Science, Multidisciplinary)no abstracts in English
Sasaki, Takayuki*; Kubo, Shintaro*; Kobayashi, Taishi*; Kirishima, Akira*; Kimura, Takaumi; Kubota, Takumi*; Takagi, Ikuji*; Moriyama, Hirotake*
Journal of Nuclear and Radiochemical Sciences, 6(1), p.51 - 54, 2005/07
no abstracts in English
Nakamichi, Masaru; Nakamura, Hirofumi; Takagi, Ikuji*
no journal, ,
no abstracts in English
Fukumoto, Masakatsu*; Yamawaki, Akifumi*; Soga, Yukihiro*; Otsuka, Yusuke*; Ueda, Yoshio*; Taniguchi, Masaki; Inoue, Takashi; Sakamoto, Keishi; Yagyu, Junichi; Arai, Takashi; et al.
no journal, ,
no abstracts in English
Fukumoto, Masakatsu*; Yamawaki, Akifumi*; Otsuka, Yusuke*; Ueda, Yoshio*; Taniguchi, Masaki; Inoue, Takashi; Sakamoto, Keishi; Yagyu, Junichi; Arai, Takashi; Takagi, Ikuji*; et al.
no journal, ,
Tungsten is considered as a candidate material for first wall armor of DT fusion reactors. However, it is anticipated that tritium might accumulate in the damage defects that caused by neutron irradiation. The present study measured deuterim accumulation in tungsten specimen after high energy hydrogen ion beam irradiation for generation of irradiation damages and then low energy deuterium beams for their accumulation. As a result, the deuterium accumulation in irradiated tungsten was enhanced as high as six times than that of original specimen.
on montmorillonite studied by time-resolved laser fluorescence spectroscopy and surface complexation modelingSasaki, Takayuki*; Ueda, Kenyo*; Saito, Takumi*; Aoyagi, Noboru; Kobayashi, Taishi*; Takagi, Ikuji*; Kimura, Takaumi; Tachi, Yukio
no journal, ,
The influence of pH, ionic strength, and the concentrations of Eu and nitrate salts on the sorption of Eu on Na-montmorillonite was investigated by batch sorption measurements. The distribution coefficient (Kd) indicated that the cation exchange reaction is significant in pH 4-7 at low ionic strength, and the formation of surface complexation is related to the pH dependence of Kd at high ionic strength. The Eu surface species were investigated using time-resolved laser fluorescence spectroscopy (TRLFS) with parallel factor analysis (PARAFAC). The PARAFAC modeling indicated two surface species, the outer-sphere (factor A) and inner-sphere (factor B) Eu complexes. Factor B was dominant at high pH and ionic strength, which was determined to be a Eu colloidal species formed at high Eu concentrations. A cation exchange model combined with a one-site non-electrostatic surface complexation model was applied to the measured Kd data, using the results of the TRLFS-PARAFAC analyses.
