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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

Kaown, Dugin ; Koh, Eun-Hee ; Mayer, Bernhard ; Kim, Heejung ; Park, Dong Kyu ; Park, Byeong-Hak ; Lee, Kang-Kun

Hydrogeology journal, 2018-09, Vol.26 (6), p.2009-2020 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
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
Autor: Kaown, Dugin ; Koh, Eun-Hee ; Mayer, Bernhard ; Kim, Heejung ; Park, Dong Kyu ; Park, Byeong-Hak ; Lee, Kang-Kun
Assuntos: Age ; AGE ESTIMATION ; Agrochemicals ; ANAEROBIC CONDITIONS ; Anaerobic processes ; Animal wastes ; Anoxic conditions ; Aquatic Pollution ; AQUIFERS ; Area ; Contaminants ; Contamination ; Data ; Data processing ; Dating techniques ; DENITRIFICATION ; Earth and Environmental Science ; Earth Sciences ; Enrichment ; ENVIRONMENTAL SCIENCES ; FERTILIZERS ; Geology ; Geophysics/Geodesy ; GROUND WATER ; Groundwater ; Groundwater age ; Hydrogeology ; Hydrologic data ; Hydrology/Water Resources ; Infiltration ; ISOTOPE SEPARATION ; Isotopes ; MANURES ; MONITORING ; NITRATES ; NITROGEN 15 ; Organic fertilizers ; OXYGEN 18 ; Pollution monitoring ; Pollution sources ; REPUBLIC OF KOREA ; RIVERS ; SAMPLING ; Surface water ; Waste Water Technology ; Water infiltration ; WATER INFLUX ; Water Management ; WATER POLLUTION ABATEMENT ; Water Pollution Control ; Water Quality/Water Pollution
É parte de: Hydrogeology journal, 2018-09, Vol.26 (6), p.2009-2020
Descrição: The 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 NO 3 -N (74–83 mg L −1 ). The δ 15 N-NO 3 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 δ 15 N-NO 3 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 δ 15 N-NO 3 and δ 18 O-NO 3 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 δ 18 O 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.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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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

Kaown, Dugin ; Koh, Eun-Hee ; Mayer, Bernhard ; Kim, Heejung ; Park, Dong Kyu ; Park, Byeong-Hak ; Lee, Kang-Kun

Berlin/Heidelberg: Springer Berlin Heidelberg

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