2023 Fiscal Year Final Research Report
Investigation of deposition mechanism of atmospheric mercury using Hg isotope analysis
| Project/Area Number |
19K12362
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 63040:Environmental impact assessment-related
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| Research Institution | National Institute for Environmental Studies |
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Principal Investigator |
Yamakawa Akane 国立研究開発法人国立環境研究所, 環境リスク・健康領域, 主任研究員 (00720286)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 大気中水銀 / 水銀同位体分析 / マルチコレクター誘導結合プラズマ質量分析計 / マウナロア観測所 |
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| Outline of Final Research Achievements |
The objectives of this study were to understand the reaction processes associated with atmospheric mercury deposition and to perform mercury isotopic analysis of atmospheric gaseous atomic mercury (GEM) collected at the Mauna Loa Observatory (MLO). The δ202Hg of GEM at MLO was lower than isotopic ratios obtained from other mountain sites. The unique atmospheric conditions at Mauna Loa (upslope winds during the day and downslope winds at night) may have caused mixing of GEM in the ground and troposphere. Even and odd mass independent isotopic fractionation of GEM suggests that oxidation of gaseous oxidized mercury (GOM) from GEM, and partitioning of GOM to particulate matter.
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| Free Research Field |
地球化学、環境化学
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| Academic Significance and Societal Importance of the Research Achievements |
水銀は様々な発生源から大気中へと放出され、乾性および湿性沈着によって大気から除去される。地上へと沈着した水銀の一部は、微生物との反応によって有害な有機水銀となり、食物連鎖を通じて生物濃縮される。水銀の人間および野生生物への健康リスクを評価するためには、特に沈着プロセスの解明が鍵を握る。そこで本研究では、GEMの水銀同位体分析に基づく大気中水銀の沈着について知見を得ることを目的とした。
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