Econ. Environ. Geol. 2010; 43(1): 43-52

Published online February 28, 2010

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Geochemical Characteristics and Nitrates Contamination of Shallow Groundwater in the Ogcheon Area

In Gyeong Lee and Sang Hoon Choi*

Department of Earth and Environmental Sciences, Chungbuk National University, Chungbuk, 361-763, Korea

Correspondence to :

Sang Hoon Choi

cshoon@chungbuk.ac.kr

Received: January 9, 2010; Accepted: February 12, 2010

Abstract

The geochemical and nitrogen isotopic analyses for shallow groundwater of Ogcheon area were carried out to characterize the geochemical characteristics of the groundwater and to identify the source of nitrate. Groundwater shows a neutral pH to weakly alkalic condition with pH values ranging from 6.9 to 8.4. The average of EC, Eh and DO is 344.2 μS/cm, 195 mV, 4 mg/L, respectively. According to piper diagram, chemical composition of groundwater is dominantly characterized by Ca-HCO3 type. On the other hand, groundwater type in the study area include Ca-Cl+NO3 type that were highly influenced by agricultural activities. NO3-N concentration of the collected samples (n=45) range from 12.4 to 34.2 mg/l. These data show that the NO3-N concentration exceeds Korea Drinking Water Standard (10 mg/l). The δ15N-NO3 values range from 2.7‰ to 18.8‰. The enrichments of heavy isotope in the groundwater indicate that major origin of nitrate pollution were associated with animal and human waste. Also the denitrification may have partly contributed as one of the sources of nitrogen.

Keywords groundwater, geochemical characteristics, nitrate, δ15N-NO3

Article

Econ. Environ. Geol. 2010; 43(1): 43-52

Published online February 28, 2010

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Geochemical Characteristics and Nitrates Contamination of Shallow Groundwater in the Ogcheon Area

In Gyeong Lee and Sang Hoon Choi*

Department of Earth and Environmental Sciences, Chungbuk National University, Chungbuk, 361-763, Korea

Correspondence to:

Sang Hoon Choi

cshoon@chungbuk.ac.kr

Received: January 9, 2010; Accepted: February 12, 2010

Abstract

The geochemical and nitrogen isotopic analyses for shallow groundwater of Ogcheon area were carried out to characterize the geochemical characteristics of the groundwater and to identify the source of nitrate. Groundwater shows a neutral pH to weakly alkalic condition with pH values ranging from 6.9 to 8.4. The average of EC, Eh and DO is 344.2 μS/cm, 195 mV, 4 mg/L, respectively. According to piper diagram, chemical composition of groundwater is dominantly characterized by Ca-HCO3 type. On the other hand, groundwater type in the study area include Ca-Cl+NO3 type that were highly influenced by agricultural activities. NO3-N concentration of the collected samples (n=45) range from 12.4 to 34.2 mg/l. These data show that the NO3-N concentration exceeds Korea Drinking Water Standard (10 mg/l). The δ15N-NO3 values range from 2.7‰ to 18.8‰. The enrichments of heavy isotope in the groundwater indicate that major origin of nitrate pollution were associated with animal and human waste. Also the denitrification may have partly contributed as one of the sources of nitrogen.

Keywords groundwater, geochemical characteristics, nitrate, δ15N-NO3

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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