Affiliation:
1. Chinese Academy of Geological Sciences Beijing 100037 China
2. School of Water Resources and Environment, China University of Geosciences (Beijing) Beijing 100083 China
Abstract
AbstractFluoride and nitrate enriched groundwater have potential threat for the safety of groundwater supply, which may cause the significant influence in human health and public safety, especially in the population aggregation area and the economic hub. This study focus on the high F‐ and NO3‐ concentration groundwater in Tongzhou District, Beijing, North China. A total of 36 groundwater samples are collected to analyze the hydrochemistry characteristic, elucidate genetic mechanism and evaluate the potential human health risks. The analysis results indicate: Firstly, most of sampled groundwater samples are characterized by Mg‐HCO3 and Na‐HCO3 with pH ranging from 7.19 to 8.28 and TDS with the large variation about 471–2337mg/L. The NO3− concentration in 38.89% groundwater samples and the F‐ concentration in 66.67% groundwater samples exceed the permissible limited value. Secondly, F‐ in groundwater originates predominantly from the water‐rock interaction and the fluorite dissolution, which is also regulated by cation exchange, competitive adsorption of HCO3‐, and alkaline environment. Thirdly, the effect of sewage disposal and agricultural activities have the significant effect on high NO3‐ concentration, while the high F‐ concentration is less influenced by anthropogenic activities. The alkaline environment favor nitrification being conducive to the production of NO3‐. Finally, the health risk assessment is evaluated for different group. The results reveal that the high NO3‐ and F‐ concentration groundwater would have the largest threaten to the children health. The results of this study could contribute to provide the scientific basis for the groundwater supply and human health in Tongzhou District.