Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Kato, Tomoaki; Kozai, Naofumi; Tanaka, Kazuya; Kaplan, D. I.*; Utsunomiya, Satoshi*; Onuki, Toshihiko
Journal of Nuclear Science and Technology, 59(5), p.580 - 589, 2022/05
Times Cited Count：4 Percentile：56.94(Nuclear Science & Technology)This study reports the effect of fulvic acids, which is a natural organic substance generally contained in groundwater, on the oxidation states of radioactive iodine anions (iodide and iodate). Iodide and iodate are contained in the contaminated water of the Fukushima Daiichi Nuclear Power Plant and supposed to be removed by activated carbon (AC) via adsorption. When fulvic acids does not exist in the experimental system, the adsorption of iodide on AC was less than that of iodate and their oxidation states after the adsorption were not changed. When fulvic acids existed, a fraction of the adsorbed iodate was reduced to iodide. This result indicates that the reduction of the adsorbed iodate progresses during the storage of the spent AC.
Kimuro, Shingo*; Kirishima, Akira*; Nagao, Seiya*; Saito, Takumi*; Amano, Yuki; Miyakawa, Kazuya; Akiyama, Daisuke*; Sato, Nobuaki*
Journal of Nuclear Science and Technology, 55(5), p.503 - 515, 2018/05
Times Cited Count：7 Percentile：58.07(Nuclear Science & Technology)no abstracts in English
Ueda, Masato; Sakamoto, Yoshiaki*
Genshiryoku Bakkuendo Kenkyu, 12(1-2), p.31 - 39, 2006/03
no abstracts in English
Ni migration through crushed rock mediaTanaka, Tadao; Sakamoto, Yoshiaki; Mukai, Masayuki; Maeda, Toshikatsu; Nakayama, Shinichi
Radiochimica Acta, 92(9-11), p.725 - 729, 2004/12
Times Cited Count：1 Percentile：10.03(Chemistry, Inorganic & Nuclear)Migration experiments of 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.
Yamaguchi, Tetsuji; Nakayama, Shinichi
JAERI-Conf 2003-018, p.115 - 116, 2003/10
Effective diffusivity was determined for Np(IV) in bentonite material in presence of carbonate and for Pu(IV) in presence of fulvic acid. Adsorption of actinides onto negatively charged mineral surfaces were investigated under conditions that actinides were predominantly present as anionic complex species. The results of this study will reveal behavior of actinides under various geological environments.
Takahashi, Yoshio*; Kimura, Takaumi; Minai, Yoshitaka*
Geochimica et Cosmochimica Acta, 66(1), p.1 - 12, 2002/01
Times Cited Count：63 Percentile：73.51(Geochemistry & Geophysics)no abstracts in English
JNC TN8400 2000-030, 17 Pages, 2000/12
JNC-TN8400-2000-030.pdf:0.44MB
As a representative of natural marine groundwater, the author selected pumped water from a Quaternary sedimentary aquifer of the Mobara gas-field in Japan and measured the concentration of total organic carbon (TOC) and of organic acid anions (formic, acetic, lactic, succinic, humic, fulvic, propionic, valeric and butyric acids). The concentration of TOC ranged from 22
1 to 240mg/L. As organic acid anions, only succinic and fulvic acids were detected and each concentration was given to be from 5.8 0.5 to 8.30.3 and from 3.30.2 to 3.50.2mg/L, respectively. By consideration of the temperature and the [SO
] of the groundwater, it is inferred that the organic acid has been significantly decomposed by activities of microbes, such as the fermentation process, CH
COO
+ H
O = HCO + CH.
Sakamoto, Yoshiaki; Nagao, Seiya; Ogawa, Hiromichi; Rao, R. R.*
Radiochimica Acta, 88(9-11), p.651 - 656, 2000/09
Times Cited Count：11 Percentile：59.85(Chemistry, Inorganic & Nuclear)no abstracts in English
Amano, Hikaru; Matsunaga, Takeshi; Nagao, Seiya; *; Watanabe, Miki*; Ueno, Takashi; Onuma, Yoshikazu*
Organic Geochemistry, 30, p.437 - 442, 1999/00
Times Cited Count：28 Percentile：52.71(Geochemistry & Geophysics)no abstracts in English
Suzuki, Yasuhiro*; Nakaguchi, Yuzuru*; Hiraki, Keizo*; Nagao, Seiya; *; *
Chikyu Kagaku, 32, p.21 - 30, 1998/00
no abstracts in English
Nagao, Seiya; R.R.Rao*; R.W.D.Killey*; J.L.Young*
Radiochimica Acta, 82, p.205 - 211, 1998/00
no abstracts in English
Suzuki, Yasuhiro*; Nagao, Seiya; Nakaguchi, Yuzuru*; Matsunaga, Takeshi; Muraoka, Susumu; Hiraki, Keizo*
Chikyu Kagaku, 31, p.171 - 180, 1997/00
no abstracts in English
Watanabe, Miki*; Amano, Hikaru; Onuma, Yoshikazu*; Ueno, Takashi; Matsunaga, Takeshi; Yanase, Nobuyuki
Proc. of 4th Int. Conf. on Nucl. and Radiochemistry, 2, 4 Pages, 1996/00
no abstracts in English
; ; ;
Suido Kyokai Zasshi, 53(4), p.35 - 42, 1984/00
no abstracts in English
Kimuro, Shingo*; Kirishima, Akira*; Akiyama, Daisuke*; Sato, Nobuaki*; Nagao, Seiya*; Amano, Yuki; Miyakawa, Kazuya; Terashima, Motoki
no journal, ,
no abstracts in English
