2023 Fiscal Year Final Research Report
Development of a method for identification and assessment of sources of nitrate-polluted groundwater using coprostanol
| Project/Area Number |
20K12209
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 64010:Environmental load and risk assessment-related
|
|---|
| Research Institution | Nagasaki University |
|---|
Principal Investigator |
Nakagawa Kei 長崎大学, 水産・環境科学総合研究科(環境), 教授 (90315135)
|
|---|
| Project Period (FY) |
2020-04-01 – 2024-03-31
|
| Keywords | 硝酸性窒素 / 地下水汚染 / コプロスタノール / カラム実験 / フィールド調査 |
|---|
| Outline of Final Research Achievements |
The purpose of this study was to investigate the migration characteristics of coprostanol using column experiments and field investigations to confirm the proposed use of coprostanol as a new method for identifying the causes of nitrate-nitrogen contamination in groundwater. The results showed that coprostanol was strongly adsorbed on the surface. A field survey revealed that coprostanol was detected even when nitrate-nitrogen concentrations were reduced due to denitrification, which was suspected to be an indication of fecal contamination. The land use upstream of the flow paths suggests that one of the factors was livestock waste.
|
| Free Research Field |
環境地下水学
|
| Academic Significance and Societal Importance of the Research Achievements |
コプロスタノールの土壌への吸着特性を明らかしたことで，地下水と河川の相互交流関係を，コプロスタノール及び硝酸性窒素を通じて明らかにすることができ，現場における地下水と河川水の挙動の理解を助け，汚染の実態調査や汚染対策を講ずる上で実務的な成果につながることが期待できる．またコプロスタノールの測定と数値シミュレーション手法を組み合わせることにより，汚染源を推定することができることが分かった．以上より，硝酸性窒素による地下水汚染が深刻である地域の水環境の修復へ筋道をつけることができ，地域の貴重な水資源の保全に繋がる成果であることから，清澄な水の確保・保全の観点からも社会的意義のある成果である．
|
