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Characteristics of Nitrate Contamination of Groundwater - Case Study of Ogcheon Area -

박호림 1 KIM MYEONG KYUN 1 Hong Sangpyo 1

1청주대학교

Accredited

ABSTRACT

Geochemical characteristics, water quality, NO3_ contamination and the origin of NO3_were analyzed for the groundwater located at Ogcheon, Korea. The water qualities were weaklyacidic to weakly alkalic and redox potentials indicated reduction condition. Compared to graniticrocks, metamorphic sedimentary rocks with intercalations of limestones and dolomites tended tobe more effectively dissolved, resulting in higher pH and higher concentrations of dissolvedingredients. Contamination of heavy metals was not revealed. Geochemical reactions of carbonate rocks and influxes of artificial contamination ingredients seemed to simultaneously determine thegeochemical characteristics and water qualities in the study area. From the results of δ15N isotopeanalysis, the origin of NO3_ was estimated to be influenced dominantly by agricultural activitiesand human feces and urine.

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