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http://dx.doi.org/10.9719/EEG.2012.45.1.023

Hydro-geochemical Nature and Nitrates Contamination Charecters of Groundwater in the Youngdong, Chungbuk Province  

Lee, In-Gyerong (Department of Earth and Environmental Sciences, Chungbuk National University)
Choi, Sang-Hoon (Department of Earth and Environmental Sciences, Chungbuk National University)
Publication Information
Economic and Environmental Geology / v.45, no.1, 2012 , pp. 23-30 More about this Journal
Abstract
Major ions and nitrogen isotopic analyses were performed to determine the geochemical characters and to identify the source of nitrate of the shallow groundwater around agricultural field in the Youngdong area. The pH value of groundwater ranges from 60. to 8.2 (pH 7.2, mean). The average of EC, Eh and DO is 369 ${\mu}S/cm$ (70~729 ${\mu}S/cm$), 165.6 mV (29~383.2 mV), 4.3 mg/L (1.8~8.0 mg/L) respectively. The ion concentraion of groundwater was in the order of $Ca^{2+}$>$Na^{2+}$>$Mg^{2+}$>$K^{2+}$ and ${HCO_3}^-$>${NO_3}^-$>${SO_4}^{2-}$>$Cl^-$>$F^-$. Most of groundwater is Ca-$HCO_3$ type. The groundwater was affected by water-rock interaction in the shallow depth. Some groundwater is Ca-Cl or Na-$HCO_3$ (2.5%) type that was due to agricultural activities. The $NO_3$_N concetration of grondwater range from 10.2 mg/l to 26.9 mg/l, which show that this area is under nitrate pollution. ${\delta}^{15}N-NO_3$ value of the groundwater is the origins of are a combination of animal wastes and man-made fertilizers.
Keywords
agricultural field; groundwater; nitrate; ${\delta}^{15}N$;
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