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중ㆍ저준위 방사성 폐기물 처분부지의 지구화학 특성 :Ⅰ. 지하수
최병영,김건영,고용권,신선호,유시원,김두행 한국방사성폐기물학회 2008 방사성폐기물학회지 Vol.6 No.4
본 연구는 방사성 폐기물 처분장의 지하수 화학 조건을 조절하는 수리지구화학 특성을 규명할 목적으로 수행되었다. 이를 위해 처분장 주변의 관측공 중 12개의 관측공이 선정되었으며, 이들 시료를 심도별로 총 46 지점에서 채취하였다. 또한 지표수 3점과 해수 1점의 시료도 채취하였다. 채취된 시료는 양/음이온 분석이 수행되었으며, 물과 용질의 기원을 규명할 추적자로서 산소-수소, 삼중수소, 탄소, 황 동위원소도 분석되었다. 산소-수소 동위원소 분석 결과 지표수와 지하수는 모두 강우 기원임을 보여주었으며, 삼중수소 농도는 깊이가 깊어짐에 따라 감소하고는 있으나 높은 삼중수소 농도는 최근에 충진된 물임을 나타내고 있었다. 양/음이온 분석 결과를 통한 수질 유형 분석에서는 연구 지역 지하수는 Ca-Na-HCO3 유형과 Na-Cl-SO4 유형이 대표적이었으며, 상관 분석 결과 이들 이온은 해염, 물-암석 반응의 영향을 받은 것으로 판단된다. 특히 연구 지역에서 Na 비율이 높은 이유는 양이온 교환 반응에 의해 이루어지고 있음을 보여 주었다. 연구 지역의 산화-환원 조건의 경우에는 심도가 깊어짐에 따라 낮은 DO와 Eh 값을 나타내어 환원 환경이 형성되었음을 나타내며, 높은 Fe와 Mn의 농도는 Fe와 Mn 산화물의 환원 반응이 산화-환원 조건을 조절하고 있음을 보여주었다. This study was carried out to identify the characteristics of hydrochemistry controlling groundwaterchemical condition in a repository site of Gyeongju. For this study, 12 bore holes of all monitoringbore holes in the study area were selected and total 46 groundwater samples were collected with depth.In addition, 3 surfacewater samples and 1 seawater sample were collected. For water samples, cationsand anions were analyzed. The environmental isotopes(18O-D, Tritium, 13C, •34S) were alsoanalyzed to trace the origin of water and solutes. The result of 18O and D analysis showed thatsurface water and groundwater were originated from precipitation. Tritium concentrations ofgroundwater decreased with depth but high concentrations of tritium indicated that groundwater wasrecharged recently. The results of ion and correlation analysis showed that groundwater types of thestudy area were represented by Ca-Na-HCO3and Na-Cl-SO4, which was caused by sea spray andwater-rock interaction. Especially, high ratio of Na content in groundwater resulted from ion exchange.For redox condition of groundwater, the values of DO and Eh decreased with depth, which indicatedthat reducing condition was formed in deeper groundwater. In addtion, high concentration of Fe andMn showed that redox condition of groundwater was controlled by the reduction of Fe and Mn oxides.
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중.저준위 방사성 폐기물 처분부지의 지구화학 특성 I. 지하수
최병영,김건영,고용권,신선호,유시원,김두행,Choi, Byoung-Young,Kim, Geon-Young,Koh, Yong-Kwon,Shin, Seon-Ho,Yoo, Si-Won,Kim, Doo-Haeng 한국방사성폐기물학회 2008 방사성폐기물학회지 Vol.6 No.4
This study was carried out to identify the characteristics of hydrochemistry controlling groundwater chemical condition in a repository site of Gyeongju. For this study, 12 bore holes of all monitoring bore holes in the study area were selected and total 46 groundwater samples were collected with depth. In addition, 3 surfacewater samples and 1 seawater sample were collected. For water samples, cations and anions were analyzed. The environmental isotopes(${\delta}^{18}O-{\delta}D$, Tritium, ${\delta}^{13}C,\;{\cdot}{\delta}^{34}S$) were also analyzed to trace the origin of water and solutes. The result of ${\delta}^{18}O\;and\;{\delta}D$ analysis showed that surface water and groundwater were originated from precipitation. Tritium concentrations of groundwater decreased with depth but high concentrations of tritium indicated that groundwater was recharged recently. The results of ion and correlation analysis showed that groundwater types of the study area were represented by Ca-Na-$HCO_3$ and Na-Cl-$SO_4$, which was caused by sea spray and water-rock interaction. Especially, high ratio of Na content in groundwater resulted from ion exchange. For redox condition of groundwater, the values of DO and Eh decreased with depth, which indicated that reducing condition was formed in deeper groundwater. In addtion, high concentration of Fe and Mn showed that redox condition of groundwater was controlled by the reduction of Fe and Mn oxides.
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