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Journal Articles

Factors controlling dissolved $$^{137}$$Cs concentrations in east Japanese rivers

Tsuji, Hideki*; Ishii, Yumiko*; Shin, M.*; Taniguchi, Keisuke*; Arai, Hirotsugu*; Kurihara, Momo*; Yasutaka, Tetsuo*; Kuramoto, Takayuki*; Nakanishi, Takahiro; Lee, S*; et al.

Science of the Total Environment, 697, p.134093_1 - 134093_11, 2019/12

 Times Cited Count:8 Percentile:62.46(Environmental Sciences)

To investigate the main factors that control the dissolved radiocesium concentration in river water in the area affected by the Fukushima Daiichi nuclear power plant accident, the correlations between the dissolved $$^{137}$$Cs concentrations at 66 sites normalized to the average $$^{137}$$Cs inventories for the watersheds with the land use, soil components, topography, and water quality factors were assessed. We found that the topographic wetness index is significantly and positively correlated with the normalized dissolved $$^{137}$$Cs concentration. Similar positive correlations have been found for European rivers because wetland areas with boggy organic soils that weakly retain $$^{137}$$Cs are mainly found on plains. However, for small Japanese river watersheds, the building area ratio in the watershed strongly affected the dissolved $$^{137}$$Cs concentration.

Journal Articles

Repeatability and reproducibility of measurements of low dissolved radiocesium concentrations in freshwater using different pre-concentration methods

Kurihara, Momo*; Yasutaka, Tetsuo*; Aono, Tatsuo*; Ashikawa, Nobuo*; Ebina, Hiroyuki*; Iijima, Takeshi*; Ishimaru, Kei*; Kanai, Ramon*; Karube, Jinichi*; Konnai, Yae*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 322(2), p.477 - 485, 2019/11

 Times Cited Count:2 Percentile:42.44(Chemistry, Analytical)

We assessed the repeatability and reproducibility of methods for determining low dissolved radiocesium concentrations in freshwater in Fukushima. Twenty-one laboratories pre-concentrated three of 10 L samples by five different pre-concentration methods (prussian-blue-impregnated filter cartridges, coprecipitation with ammonium phosphomolybdate, evaporation, solid-phase extraction disks, and ion-exchange resin columns), and activity of radiocesium was measured. The z-scores for all of the $$^{137}$$Cs results were within $$pm$$2, indicating that the methods were accurate. The relative standard deviations (RSDs) indicating the variability in the results from different laboratories were larger than the RSDs indicating the variability in the results from each separate laboratory.

Oral presentation

Imaging and quantitative analysis of root exudates of soybean root

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Koyanagi, Atsushi*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Visualization and evaluation of secretion of organic substances from soybean root to soil using $$^{11}$$CO$$_{2}$$ and a positron-emitting tracer imaging system (PETIS)

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Koyanagi, Atsushi; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

Oral presentation

Visualization and evaluation of secretion from soybean root to soil using a positron-emitting tracer imaging system (PETIS)

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Koyanagi, Atsushi*; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Visualization and evaluation of secretion from root to soil using a positron-emitting tracer imaging system (PETIS)

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Koyanagi, Atsushi*; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Evaluation of secretion from soybean root to soil using a positron-emitting tracer imaging system (PETIS)

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Visualization of secretion from soybean root using a positron-emitting tracer imaging system (PETIS)

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Kurita, Keisuke; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Visualization and quantitative analysis of secretions from soybean root, 2; Comparison of distribution of the secretions in different culture medium

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Kurita, Keisuke; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Investigation of factors controlling dissolved $$^{137}$$Cs concentrations in Japanese rivers

Tsuji, Hideki*; Shin, M.*; Taniguchi, Keisuke*; Arai, Hirotsugu*; Kurihara, Momo*; Yasutaka, Tetsuo*; Kuramoto, Takayuki*; Nakanishi, Takahiro; Lee, S*; Shinano, Takuro*; et al.

no journal, , 

To predict the behavior of particulate and dissolved radiocesium ($$^{137}$$Cs) in river water, some soil and land use categories in the watershed should be considered because these may affect the dissolved $$^{137}$$Cs concentration. In this study, to investigate the factors that affect dissolved $$^{137}$$Cs concentrations in Japanese rivers, we measured dissolved $$^{137}$$Cs concentrations in 67 rivers under baseflow conditions 13-280 km from the Fukushima Daiichi Nuclear Power Plant in August and September 2017.

Oral presentation

Factors controlling dissolved $$^{137}$$Cs concentrations in east Japanese rivers

Tsuji, Hideki*; Ishii, Yumiko*; Hayashi, Seiji*; Shin, M.*; Taniguchi, Keisuke*; Arai, Hirotsugu*; Kurihara, Momo*; Yasutaka, Tetsuo*; Kuramoto, Takayuki*; Nakanishi, Takahiro; et al.

no journal, , 

Controlling factor of dissolved $$^{137}$$Cs concentrations in 66 in East Japan rivers was investigated. Dissolved $$^{137}$$Cs concentrations decreased by one order of magnitude between 2012 and 2017. Normalized dissolved $$^{137}$$Cs concentrations correlated well with building area ratios. Topographic wetness index generally predicted dissolved $$^{137}$$Cs concentrations. The high concentration of dissolved $$^{137}$$Cs in urban area cannot be explained by water quality condition.

Oral presentation

Miracle world in the soil; Rhizosphere

Yin, Y.-G.*; Suzui, Nobuo*; Kurita, Keisuke; Miyoshi, Yuta*; Unno, Yusuke*; Fujimaki, Shu*; Nakamura, Takuji*; Shinano, Takuro*; Kawachi, Naoki*

no journal, , 

no abstracts in English

Oral presentation

Development of new imaging method for visualising photosynthate translocation and release in plant root systems

Yin, Y.-G.*; Suzui, Nobuo*; Kurita, Keisuke; Miyoshi, Yuta*; Unno, Yusuke*; Fujimaki, Shu*; Nakamura, Takuji*; Shinano, Takuro*; Kawachi, Naoki*

no journal, , 

In this study, we developed a new method to visualize and evaluate the movement of $$^{11}$$C-photosynthates into the root system and 11C-rhizodeposits released in the soil coupled with positional information using the positron-emitting tracer imaging system. A newly developed rhizobox was consisted of a square nylon mesh bag containing the root system and a pair of soil boxes, and it could be distinguishing the $$^{11}$$C signal of soil from that of root. Test plants of white lupin (Lupinus albus) and soybean (Glycine max) were grown in the rhizobox, and fed $$^{11}$$CO$$_{2}$$ as a pulse. Simultaneously, the behavior of 11C-photosynthates into the root system and the distribution of $$^{11}$$C-rhizodeposits released in the rhizosphere soil were visualized.

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