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ISSN : 1738-1894(Print)
ISSN : 2288-5471(Online)
ISSN : 2288-5471(Online)
중ㆍ저준위 방사성 폐기물 처분부지의 지구화학 특성 :Ⅰ. 지하수
Geochemical characteristics of a LILW repository : Ⅰ. Groundwater
Abstract
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.
Reference
JNFCWT
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Korean Radioactive
Waste Society (KRS)
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