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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kim, Heejung Lee, Kang-Kun Kaown, Dugin Mayer, Bernhard Lee, Jin-Yong Hyun, Yunjung |
| Spatial Coverage | Republic of Korea |
| Description | Country affiliation: South Korea Author Affiliation: Kim H ( School of Earth and Environmental Sciences (BK21 SEES), Seoul National University, Seoul 151-747, South Korea.); Kaown D ( School of Earth and Environmental Sciences (BK21 SEES), Seoul National University, Seoul 151-747, South Korea. Electronic address: dugin1@snu.ac.kr.); Mayer B ( Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary T2N 1N4, Alberta, Canada.); Lee JY ( Department of Geology, Kangwon National University, Chuncheon 200-701, South Korea.); Hyun Y ( Planning and Management Group, Korea Environment Institute, Sejong 339-007, South Korea.); Lee KK ( School of Earth and Environmental Sciences (BK21 SEES), Seoul National University, Seoul 151-747, South Korea.) |
| Abstract | An integrated study based on hydrogeochemical, microbiological and dual isotopic approaches for nitrate and sulfate was conducted to elucidate sources and biogeochemical reactions governing groundwater contaminants in different seasons and under different land use in a basin of Korea. The land use in the study area is comprised of forests (58.0%), vegetable fields (27.6%), rice paddy fields (11.4%) and others (3.0%). The concentrations of NO3-N and SO4(2-) in groundwater in vegetable fields were highest with 4.2-15.2 mg L(-1) and 1.6-19.7 mg L(-1) respectively, whereas under paddy fields NO3-N concentrations ranged from 0 to 10.7 mg L(-1) and sulfate concentrations were ~15 mg L(-1). Groundwater with high NO3-N concentrations of >10mgL(-1) had δ(15)N-NO3(-) values ranging from 5.2 to 5.9 and δ(18)O values of nitrate between 2.7 and 4.6 suggesting that the nitrate was mineralized from soil organic matter that was amended by fertilizer additions. Elevated concentrations of SO4(2-) with δ(34)S-SO4(2-) values between 1 and 6 in aquifers in vegetable fields indicated that a mixture of sulfate from atmospheric deposition, mineralization of soil organic matter and from synthetic fertilizers is the source of groundwater sulfate. Elevated δ(18)O-NO3(-) and δ(18)O-SO4(2-) values in samples collected from the paddy fields indicated that denitrification and bacterial sulfate reduction are actively occurring removing sulfate and nitrate from the groundwater. This was supported by high occurrences of denitrifying and sulfate reducing bacteria in groundwater of the paddy fields as evidenced by 16S rRNA pyrosequencing analysis. This study shows that dual isotope techniques combined with microbial data can be a powerful tool for identification of sources and microbial processes affecting NO3(-) and SO4(2-) in groundwater in areas with intensive agricultural land use. |
| ISSN | 00489697 |
| Volume Number | 533 |
| e-ISSN | 18791026 |
| Journal | Science of The Total Environment |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-11-15 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Environmental Monitoring Groundwater Chemistry Nitrates Analysis Water Microbiology Water Pollutants, Chemical Agriculture Microbiology Republic Of Korea Journal Article Research Support, Non-u.s. Gov't Discipline Environmental Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Waste Management and Disposal Pollution Environmental Engineering |
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