Health risk assessment of groundwater nitrogen pollution in Songnen Plain
WU Juan-juan1,2, BIAN Jian-min1,2, WAN Han-li1,2, WEI Nan3, MA Yu-xi1,2
1. College of New Energy and Environment Institute, Jilin University, Changchun 130021, China; 2. Key Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China; 3. Chinese Academy of Environmental Planning, Beijing 100012, China
Abstract:To explore the Songnen Plain of nitrogen pollution and its effect on human health, this study employed shallow groundwater sampling test data, geostatistical analysis and conducted the triangular random model to assess the risk of nitrogen exposure in children and adults, and performed the uncertainty analysis. The results showed that:The main nitrogen pollutants was nitrate nitrogen, and the sample exceeded the standard rate of 44.35%, and the maximum value reached 566.2mg/L, and the region with a concentration of nitrate nitrogen greater than 20mg/L accounted for about 60% of the total area in the region, mainly distributed in the high plain area of the eastern and central parts, and the western front slope plain was less polluted; Based on the triangular fuzzy coupled stochastic model on the Isight 5.9-2platform, considering the impact of human activities and agricultural development, the study area was divided into different units. The non-carcinogenic risk ranking was:evaluation unit Ⅲ> evaluation unit Ⅱ>evaluation unit I, and the contaminants in Unit Ⅲ were mainly derived from agricultural activities, and the risks in Units Ⅲ and Ⅱ were much higher than the safety threshold value of 1, which may cause potential harm to children and adults, and threaten children more; The uncertainty of pollutant concentration and parameters had a large fluctuation range for the risk value, and the triangular random model was more sensitive to data changes, which can reduce the uncertainty of the triangular fuzzy method. The unit I risk interval value crossed the safety threshold 1, and it may mislead pollution prevention and control decisions; the contribution rate of nitrate nitrogen concentration to risk was above 90%, which clarified the necessity of random sampling to improve the reliability of the evaluation results.
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