|
| Genetic Mechanism and Health Risk Assessment of Uranium in Groundwater of Datong Basin |
|
Received:December 19, 2023
Revised:December 28, 2023
Accepted:January 03, 2024
Published Online:March 04, 2024
|
| View Full Text View/Add Comment Download reader |
| DOI：doi：10.3969/j.issn.1007-7545.2024.04.009 |
| KeyWord:Datong Basin; groundwater; uranium; geochemistry; numerical simulation; health risk assessment |
| Author | Institution |
| SHAO Zheng |
东华理工大学 |
| GE Qin |
东华理工大学 |
| MI Zhenhua |
江西省煤田地质勘察研究院 |
| CHEN Gongxin |
东华理工大学 |
| LI Xiang |
东华理工大学 |
| ZHANG Hanyue |
东华理工大学 |
|
| Hits: 1337 |
| Download times: 1121 |
| Abstract: |
| The distribution characteristics of uranium (U) in groundwater, enrichment mechanisms, and exposure risks to different populations were investigated to provide data support for the protection and sustainable utilization of groundwater resources in arid and semi-arid areas. Based on Shukarev classification, thermodynamic calculation, hydrogeochemical numerical simulation and human health risk assessment (HRA), the distribution characteristics and morphological distribution of U pollution in groundwater and surface water in Datong Basin were analyzed, the formation mechanism of U in groundwater was interpreted, and the exposure risk of U pollution to different populations was assessed. The results show that the total dissolved solids (TDS) in groundwater has a wide range of distribution, from 27.60 mg/L to 4 034.00 mg/L. The shallow groundwater (Zone I) generally has higher TDS, ranging from 338.00 mg/L to 4 034.00 mg/L (with an average of 1 371.80 mg/L), the concentration of U varies from 0 to 2.44 mg/L (with an average of 0.26 mg/L), and the exceeding standard rate is 71.74%. The vertical distribution of U concentration is consistent with the concentrations of total organic carbon (TOC), nitrate (NO3-), and sulfate (SO42-). Overall, the concentrations drop with increase of burial depth. Redox conditions, complexation, adsorption, and evaporation concentration are the mechanisms controlling the concentration and speciation distribution of U in groundwater in the study area. Among them, reduction under microbial participation plays a key role in constraining the U concentration in groundwater. In addition, the formation of mobile UO2(CO3)22- and UO2(CO3)34- stable complexes through the reaction between uranyl ions (UO22+) and carbonate ligands is one of the factors influencing the migration of U in groundwater. The results of the human health risk assessment indicate that the non-carcinogenic risks from groundwater and surface water are highest for children, followed by young adults and then adults. The exceeding standard rate of non-carcinogenic risks is highest for surface water and Zone I groundwater (100%). |
| Close |
|
|
|