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Variation in Nitrate Contamination of Shallow Groundwater in a Farmland in Gyeonggi-do, Korea  

Lee, Eun-Jae (Department of Earth System Sciences, Yonsei University)
Woo, Nam-Chil (Department of Earth System Sciences, Yonsei University)
Lee, Byung-Sun (Rural Research Institute, Korea Rural Community & Agriculture Corporation)
Kim, Yang-Bin (Rural Research Institute, Korea Rural Community & Agriculture Corporation)
Publication Information
Economic and Environmental Geology / v.41, no.4, 2008 , pp. 393-403 More about this Journal
Abstract
Hydrogeochemistry of groundwater was studied in order to identify the influence of cow manure, distributed to a farmland as organic fertilizer, on nitrate concentrations in shallow groundwater and its spatio-temporal variations. From monitoring wells, water levels were measured using automatic data loggers, and water samples collected and analyzed in Feb., April, June and Oct. 2007. The average electric conductivity and concentration of nitrate in the groundwater show the highest levels in April and decline in subsequent sampling times. Decreases in dissolved oxygen(DO) and nitrate concentrations from April to Oct. and corresponding increases in $HCO_3$ concentrations indicate denitrification processes by microorganisms. Spatial variation of nitrate concentration appeared to be affected by the redox conditions of groundwater controlled by geochemical reactions of Mn, Fe and DOC contents.
Keywords
farmland; shallow groundwater; nitrate; denitrification; spatio-temporal variation;
Citations & Related Records
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