Identification of groundwater contamination sources of nitrate and sulfate in shallow alluvial aquifers using a dual-isotope approach in an agricultural area

HR: 0800h
AN: H11C-0661 [Abstracts]
TI: Identification of groundwater contamination sources of nitrate and sulfate in shallow alluvial aquifers using a dual-isotope approach in an agricultural area
AU: * Kaown, D
EM: dugin1@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-747, Korea, Republic of
AU: Koh, D
EM: chankoh@kigam.re.kr
AF: Korea Institute of Geoscience and Mineral Resources, 30 Gajeong-dong, Yuseong-gu, Daejeon, 305-350, Korea, Republic of
AU: Mayer, B
EM: bmayer@ucalgary.ca
AF: Department of Geology and Geophysics, University of Calgary, Calgary, AB T2N 1N4, Canada
AU: Hyun, Y
EM: yjhyun@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-747, Korea, Republic of
AU: Bae, G
EM: gokbae@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-747, Korea, Republic of
AU: Lee, K
EM: kklee@snu.ac.kr
AF: School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-747, Korea, Republic of
AB: The elevated level of nitrate in groundwater is a serious problem in Korean agricultural areas. Yupori, a small agricultural area in Chuncheon (Korea), shows a rising level of NO3-N and displays multiple NO3-N sources from non-point and point sources in shallow aquifer groundwater. Numerous vegetable fields are located in the western part of the study area and fruit orchards dominate the landscape with only few vegetable fields in the eastern part of the study area. The source identification of groundwater contamination from overburden agricultural area was undertaken by analyzing hydrochemical data and stable isotopic compositions of dissolved nitrate and sulfate (Ѕф15N-NO3-, Ѕф18O-NO3-, Ѕф34S-SO42-, and Ѕф18O-SO42-). The measurements of Ѕф15N- NO3- are in the range of 7.1 to 14.4ЂЖ and the values of Ѕф18O-NO3- are in the range of -1.8 to 6.5ЂЖ. High Ѕф15N-NO3- values shown at low concentrations of nitrate in the eastern Yupori are characteristics of manure- derived nitrate and organic soil. The values of Ѕф34S-SO4-2 ranged from 2.9 to 9.9ЂЖ and Ѕф18O-SO42- ranged from 2.5 to 4.7ЂЖ. At high concentrations of SO42- in the western Yupori, the value of Ѕф34S-SO42- are low around 3-4ЂЖ. The value of Ѕф34S-SO42- increased with decreasing SO42- concentration in the eastern Yupori. Groundwater quality and stable isotopic compositions of dissolved nitrate and sulfate seem to be significantly affected by agricultural land use pattern of the study site.
DE: 1831 Groundwater quality
DE: 1880 Water management (6334)
SC: Hydrology [H]
MN: 2007 Fall Meeting