期刊
ENVIRONMENTAL EARTH SCIENCES
卷 66, 期 4, 页码 1127-1136出版社
SPRINGER
DOI: 10.1007/s12665-011-1320-5
关键词
Nitrate; Groundwater; Nitrogen isotope; Agricultural area; Geochemistry; Risk assessment
资金
- Korea Ministry of Environment
The nitrate of groundwater in the Gimpo agricultural area, South Korea, was characterized by means of nitrate concentration, nitrogen-isotope analysis, and the risk assessment of nitrogen. The groundwaters belonging to Ca-(Cl + NO3) and Na-(Cl + NO3) types displayed a higher average NO3 (-) concentration (79.4 mg/L), exceeding the Korean drinking water standard (< 44.3 mg/L NO3 (-)). The relationship between delta O-18-NO3 (-) values and delta N-15-NO3 (-) values revealed that nearly all groundwater samples with delta N-15-NO3 (-) of +7.57 to +13.5aEuro degrees were affected by nitrate from manure/sewage as well as microbial nitrification and negligible denitrification. The risk assessment of nitrate for groundwater in the study area was carried out using the risk-based corrective action model since it was recognized that there is a necessity of a quantitative assessment of health hazard, as well as a simple estimation of nitrate concentration. All the groundwaters of higher nitrate concentration than the Korean drinking water standard (< 44.3 mg/L NO3 (-)) belonged to the domain of the hazard index < 1, indicating no health hazard by nitrate in groundwater in the study area. Further, the human exposure to the nitrate-contaminated soil was below the critical limit of non-carcinogenic risk.
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