論文

査読有り
2017年1月

Fractionation of radiocesium in soil, sediments, and aquatic organisms in Lake Onuma of Mt. Akagi, Gunma Prefecture using sequential extraction

SCIENCE OF THE TOTAL ENVIRONMENT
  • Masanobu Mori
  • ,
  • Kin-ichi Tsunoda
  • ,
  • Shoichi Aizawa
  • ,
  • Yoichi Saito
  • ,
  • Yuko Koike
  • ,
  • Takahiro Gonda
  • ,
  • Shunji Abe
  • ,
  • Kyuma Suzuki
  • ,
  • Yumi Yuasa
  • ,
  • Toshihiro Kuge
  • ,
  • Hideki Tanaka
  • ,
  • Hajime Arai
  • ,
  • Shun Watanabe
  • ,
  • Seiichi Nohara
  • ,
  • Yoshitaka Minai
  • ,
  • Yukiko Okada
  • ,
  • Seiya Nagao

575
開始ページ
1247
終了ページ
1254
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.scitotenv.2016.09.205
出版者・発行元
ELSEVIER SCIENCE BV

The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident has resulted in the contamination of the environment in Gunma Prefecture with radioisotope cesium(radio-Cs, Cs-134 and Cs-137). Concentrations of radio-Cs > 500 Bq kg(-1) were found in wakasagi (Hypomesus nipponensis) in Lake Onuma at the top of Mount (Mt.) Akagi in August 2011. To explain the mechanism of this contamination, monitoring studies have been conducted around Lake Onuma by measuring radio-Cs concentrations in samples of fish, aquatic plants, plankton, lake water, lake sediments, and surrounding soil. The leachability of radio-Cs was evaluated using sequential extraction by Tessier et al. The total concentration of radio-Cs in Lake Onuma ecosystems decreased gradually with time. In the brown forest soil, radio-Cs concentrations of 2000 to 6000 Bq kg(-1) were detected. The abundance ratio of the easy-elution form(exchangeable and carbonate forms) in the samples was <10%. The concentrations in phytoplankton samples were 3-6 times higher than those in wakasagi samples. The ratios of easy-elution forms increased by the rank in the food chain; 37% in phytoplankton, 78% in zooplankton, and 97% in wakasagi. It is likely that the lower ratio of the easy-elution form in phytoplankton is related to the adsorption of radio-Cs on suspended substances in the lake, as suggested by the analyses of aluminum and titanium in the phytoplankton, zooplankton, and wakasagi samples. The high concentrations of radio-Cs in wakasagi would be related also to the characteristics of closed mountain lakes. (C) 2016 Elsevier B.V. All rights reserved.

Web of Science ® 被引用回数 : 8

リンク情報
DOI
https://doi.org/10.1016/j.scitotenv.2016.09.205
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/27707667
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000390373400126&DestApp=WOS_CPL

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