초록

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Abstract ▼ AI-Helper

To investigate the hydro-geochemical condition and the extent of groundwater contamination from the Sunchang-Gun area, the chemistry and δ15N from the 90 borehole wells were carefully measured. The pH was found to be within the limits of the drinking water base. The EC was slightly higher than the m...

To investigate the hydro-geochemical condition and the extent of groundwater contamination from the Sunchang-Gun area, the chemistry and δ15N from the 90 borehole wells were carefully measured. The pH was found to be within the limits of the drinking water base. The EC was slightly higher than the mean value of that of the whole country. Water hardness of the alluvial aquifer was greater than that of bedrock. Moreover, the weathered metamorphic rock area was found to have harder water than the volcanic rock area. The types of groundwater were identified as Ca-HCO3, but it shifted to (Na+K)-Cl type in several groundwater contaminated by domestic sewage. Shallow groundwater was affected by NO3-N of about 54%. NO3-N was concentrated over the drinking water standard level of about 16%, and it was over the life using the water standard level of about 3.3%. The NO3-N concentrations of the alluvium aquifer groundwater (23%) were higher than that of the bedrock aquifer groundwater (10%). δ15N suggests that nitrate originating from manure was about 57% of groundwater, and other amounts originated from domestic sewage. Organic nitrate fertilizers may be the origin of nitrate in Sunchang area"s groundwater.

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