Application of multiple-isotope and groundwater-age data to identify factors affecting the extent of denitrification in a shallow aquifer near a river in South Korea

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dc.contributor.authorKaown, Dugin
dc.contributor.authorKoh, Eun-Hee
dc.contributor.authorMayer, Bernhard
dc.contributor.authorKim, Heejung
dc.contributor.authorPark, Dong Kyu
dc.contributor.authorPark, Byeong-Hak
dc.contributor.authorLee, Kang-Kun
dc.date.accessioned2023-03-18T05:04:46Z
dc.date.available2023-03-18T05:04:46Z
dc.date.issued2018-01-16
dc.description.abstractThe extent of denitrification in a small agricultural area near a river in Yangpyeong, South Korea, was determined using multiple isotopes, groundwater age, and physicochemical data for groundwater. The shallow groundwater at one monitoring site had high concentrations of NO3-N (74–83 mg L−1). The δ15N-NO3 values for groundwater in the study area ranged between +9.1 and +24.6‰ in June 2014 and +12.2 to +21.6‰ in October 2014. High δ15N-NO3 values (+10.7 to +12.5‰) in both sampling periods indicated that the high concentrations of nitrate in the groundwater originated from application of organic fertilizers and manure. In the northern part of the study area, some groundwater samples showed elevated δ15N-NO3 and δ18O-NO3 values, which suggest that nitrate was removed from the groundwater via denitrification, with N isotope enrichment factors ranging between −4.8 and −7.9‰ and O isotope enrichment factors varying between −3.8 and −4.9‰. Similar δD and δ18O values of the surface water and groundwater in the south appear to indicate that groundwater in that area was affected by surface-water infiltration. The mean residence times (MRTs) of groundwater showed younger ages in the south (10–20 years) than in the north (20–30 years). Hence, it was concluded that denitrification processes under anaerobic conditions with longer groundwater MRT in the northern part of the study area removed considerable amounts of nitrate. This study demonstrates that multi-isotope data combined with physicochemical data and age-dating information can be effectively applied to characterize nitrate contaminant sources and attenuation processes.en_US
dc.identifier.citationKaown, D., Koh, E.-H., Mayer, B., Kim, H., Park, D. K., Park, B.-H., & Lee, K.-K. (2018). Application of multiple-isotope and groundwater-age data to identify factors affecting the extent of denitrification in a shallow aquifer near a river in South Korea. Hydrogeology Journal, 26(6), 2009–2020. https://doi.org/10.1007/s10040-017-1716-8en_US
dc.identifier.doihttps://doi.org/10.1007/s10040-017-1716-8en_US
dc.identifier.urihttp://hdl.handle.net/1880/115942
dc.identifier.urihttps://doi.org/10.11575/PRISM/46147
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.publisher.departmentGeoscienceen_US
dc.publisher.facultyScienceen_US
dc.publisher.hasversionacceptedVersionen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.publisher.policyhttps://www.springernature.com/gp/open-research/policies/journal-policiesen_US
dc.rightsUnless otherwise indicated, this material is protected by copyright and has been made available with authorization from the copyright owner. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.titleApplication of multiple-isotope and groundwater-age data to identify factors affecting the extent of denitrification in a shallow aquifer near a river in South Koreaen_US
dc.typejournal articleen_US
ucalgary.item.requestcopyfalseen_US
ucalgary.scholar.levelFacultyen_US
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