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Journal Articles

Speciation study on complex formation of uranium(VI) with phosphate and fluoride at high temperatures and pressures by time-resolved laser-induced fluorescence spectroscopy

Kirishima, Akira; Kimura, Takaumi; Tochiyama, Osamu*; Yoshida, Zenko

Radiochimica Acta, 92(12), p.889 - 896, 2005/01

https://doi.org/10.1524/ract.92.12.889.55111
 Times Cited Count：24 Percentile：81.07(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Influence of humic substances on the $$^{63}$$Ni migration through crushed rock media

Tanaka, Tadao; Sakamoto, Yoshiaki; Mukai, Masayuki; Maeda, Toshikatsu; Nakayama, Shinichi

Radiochimica Acta, 92(9-11), p.725 - 729, 2004/12

https://doi.org/10.1524/ract.92.9.725.54987
 Times Cited Count：1 Percentile：10.03(Chemistry, Inorganic & Nuclear)

Migration experiments of $$^{63}$$Ni for crushed rocks, granite and tuff, were performed under the coexistent condition with a humic acid and a fulvic acid of 0-30 mg/l in concentration, which are Nordic humic substances supplied from International Humic Substance Society. Migration experiments of Ni had been performed by a column system, to investigate migration behavior of Ni through a column packed crushed rock. The Ni concentration in the effluent passed through the column was corresponding to the fractional percentage of Ni complexing with humic substance in influent solution. This result suggests that the Ni complexing with humic substance in influent solution was flowed out from the column without any effective interactions with the rock media. The migration behavior of Ni could be expressed by a migration model taking account of the complexation kinetics of Ni with humic substance in the aqueous phase.

Journal Articles

Interactions between anionic complex species of actinides and negatively charged mineral surfaces

Yamaguchi, Tetsuji; Nakayama, Shinichi; Yoshida, Takahiro

Radiochimica Acta, 92(9-11), p.677 - 682, 2004/12

https://doi.org/10.1524/ract.92.9.677.55009
 Times Cited Count：6 Percentile：40.72(Chemistry, Inorganic & Nuclear)

Adsorption of actinides onto negatively charged mineral surfaces was investigated under conditions that actinides were predominantly present as anionic complex species: Th(CO$$_{3}$$)$$_{5}$$$$^{6-}$$, Am(CO$$_{3}$$)$$_{3}$$$$^{3-}$$, Np(CO$$_{3}$$)$$_{2}$$(OH)$$_{2}$$$$^{2-}$$, UO$$_{2}$$(OH)$$_{4}$$$$^{2-}$$, NpO$$_{2}$$(OH)$$_{2}$$$$^{-}$$, Sn(OH)$$_{5}$$$$^{-}$$ and Pb(OH)$$_{3}$$$$^{-}$$. These solutions were left to stand for 2 days to confirm these elements stable in dissolved state, and then contacted with minerals, $$gamma$$-Al$$_{2}$$O$$_{3}$$ or SiO$$_{2}$$ (AEROSIL, specific surface area: 10$$^{5}$$ m$$^{2}$$ kg$$^{-1}$$). After desired contact time for 2 days or more, the solutions were ultra-filtered through 10$$^{4}$$-molecular-weight cutoff Millipore filters and the concentrations of the elements in the filtrates were determined. The sorption experiments were performed at room temperature (25$$^{circ}$$C) under Ar. Distribution coefficients decreased with the increasing pH and with increasing carbonate concentrations. The monotonous decrease in the distribution coefficients in the investigated pH range suggests that the electrostatic repulsion was a dominant interaction between anionic complex species of actinides and negatively charged mineral surfaces.

Journal Articles

Luminescence properties of tetravalent uranium in aqueous solution

Kirishima, Akira; Kimura, Takaumi; Nagaishi, Ryuji; Tochiyama, Osamu*

Radiochimica Acta, 92(9-11), p.705 - 710, 2004/12

https://doi.org/10.1524/ract.92.9.705.54971
 Times Cited Count：28 Percentile：84.49(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Interactions of trivalent and tetravalent heavy metal-siderophore complexes with ${it Pseudomonas fluorescens}$

Yoshida, Takahiro; Ozaki, Takuo; Onuki, Toshihiko; Francis, A. J.*

Radiochimica Acta, 92(9-11), p.749 - 753, 2004/12

https://doi.org/10.1524/ract.92.9.749.55003
 Times Cited Count：14 Percentile：66.09(Chemistry, Inorganic & Nuclear)

Accumulation of Fe(III)-, Eu(III)-, Hf(IV)-, and Pu(IV)-desferrioxamine B (DFO) complexes by aerobic bacterium, ${it Pseudomonas fluorescens}$ (ATCC 55241) was studied in order to elucidate stability of DFO complexes on biosorption. When Eu(III)-DFO complex was incubated with bacteria in 0.1 M Tris-HCl buffer (pH = 7.2), the metals were removed from solution, with no change in DFO concentration in solution. On the other hand, Fe(III)-, Hf(IV)-, and Pu(IV)-DFO complexes were not accumulated to bacteria. Metals with high charge to ionic radius ratio (Z/r) suppress the dissociation of complexes, leading small bacterial accumulation.

Journal Articles

Diffusion and Migration of Ions Sedimentary Rock Matrix: Thermodynamic Properties of Porewater in Sandstone

Sato, Haruo

Kokusai Kaigi Sanka Hokoku MIGRATION Kokusai Kaigi Migration'03: Dai-9-Kai Chichu Deno Akuchinido Oyobi Kaku Bunretsu Seiseibutsu No Kagaku Oyobi Iko Kyodo Ni Kansuru Kokusai Kaigi: Kaigi Hokoku, 0 Pages, 2003/00

None

Journal Articles

The Effects of Silica Sand Content and NaNO$$_{3}$$ Concentration on Diffusion of C, Cl and I in Compacted Bentonite

Ishidera, Takamitsu; Sato, Haruo; Miyamoto, Shinya

Migration 2003, PB-4, 145 Pages, 2003/00

None

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