| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2024-08-08 |
| タイトル |
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タイトル |
Factors of slow decline in the activity concentration of 137Cs in eutrophic lake water |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Ishii Nobuyoshi
Furota Toshio
Tagami Keiko
Murakami Masashi
Ohte Nobuhito
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
We investigated the activity concentrations of dissolved 137Cs, particulate 137Cs, and total 137Cs (the sum of dissolved and particulate 137Cs) in Lake Inba, Japan from 2019 to 2022 to predict long-term decline in the 137Cs contamination. The effective half-lives of dissolved and total 137Cs were 2.9 years and 18.1 years, respectively. We also observed no decreasing trend of particulate 137Cs. These results suggested that the more gradual decrease in total 137Cs is caused by the small decline in particulate 137Cs. To be decreased total 137Cs, particulate 137Cs must be decreased. We found that the particulate 137Cs concentrations were correlated with the suspended solid (SS) and volatile suspended solids (VSS) concentrations and that the SS concentrations were positively correlated with the chlorophyll a concentrations. Phytoplankton which are the chlorophyll a host are classified into the particulate fraction, and thus particulate 137Cs were contained in phytoplankton which had accumulated 137Cs. We think that phytoplankton is also an important component of particulate 137Cs in eutrophic lakes although the main factor determining particulate 137Cs concentration is inorganic SS. Since phytoplankton is a food resource for fish, it is necessary to examine in detail the relationship of 137Cs contamination of fish with particulate 137Cs and phytoplankton. |
| 書誌情報 |
ACS ES&T Water
巻 4,
号 4,
p. 1274,
発行日 2024-03
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| 出版者 |
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出版者 |
ACS Publications |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
2690-0637 |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1021/acsestwater.3c00338 |
