| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2025-09-02 |
| タイトル |
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|
タイトル |
Deep groundwater in the Kumamoto area affected by nitrate nitrogen with source origin by sterols |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Groundwater contamination |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Nitrate nitrogen |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
BiomarkersSterols |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Deep groundwater |
| 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 |
Nakagawa, Kei
Li, Zhuolin
Hosono, Takahiro
Takao, Yuji
Berndtsson, Ronny
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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 |
Nitrate nitrogen contamination of groundwater is often related to agricultural production and is a common problem in many parts of the world, particularly in regions that depend on groundwater for water supply. Nitrate nitrogen concentrations in groundwater in the Kumamoto area have increased in recent years, and countermeasures are urgently needed. Identifying the causes and sources of contamination is important for counteracting such contamination. For this purpose, continuous groundwater monitoring was conducted over a period of more than one year, and nitrate nitrogen concentrations and sterol compounds were analyzed as indicators. Nitrate nitrogen concentrations ranged from 0.07 to 4.86 mg L−1, with most sites remaining below the natural background threshold of 3 mg L−1. Sterol ratios generally remained below the fecal contamination threshold of 0.3, except for 0.354, which was observed in February 2023. Principal component analysis was applied to characterize the variation patterns in sterol composition, revealing that β-sitosterol and cholesterol contributed most strongly to the first principal component, whereas coprostanol and cholestanol dominated the second principal component. Hierarchical cluster analysis further classified the samples into five clusters, identifying beef and dairy cattle manure as the primary sources of groundwater pollution. Although measuring sterols is useful for estimating the origin of nitrate nitrogen pollution and as an indicator of fecal contamination, observations must be continuous and not intermittent because of hydrophobicity and high adsorption rates in the solid phase. Therefore, it is necessary to continuously collect and measure water samples for longer periods, probably for at least one year. |
|
言語 |
en |
| 書誌情報 |
en : Journal of Hydrology
巻 662,
p. art. no. 134101,
発行日 2025-08-25
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| 出版者 |
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|
出版者 |
Elsevier B.V. |
|
言語 |
en |
| 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 |
00221694 |
| DOI |
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関連タイプ |
isIdenticalTo |
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|
識別子タイプ |
DOI |
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関連識別子 |
10.1016/j.jhydrol.2025.134101 |
| 権利 |
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|
権利情報 |
© 2025 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/. |
|
言語 |
en |
| 著者版フラグ |
|
|
出版タイプ |
AM |
|
出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| 引用 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
Journal of Hydrology, 662, art. no. 134101; 2025 |
|
言語 |
en |
JH662_134101.pdf (3.8 MB)
