Evaluating the genesis and dominant processes of groundwater salinization by using hydrochemistry and multiple isotopes in a mining city
| Autor: | Liqun Zhang, Yongchun Chen, Liugen Zheng, Jie Hu, Chunlu Jiang, Xing Chen, Fu Xianjie, Shigui Chen |
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| Rok vydání: | 2021 |
| Předmět: |
Hydrogeology
Soil salinity 010504 meteorology & atmospheric sciences δ18O Health Toxicology and Mutagenesis Soil science General Medicine 010501 environmental sciences engineering.material Toxicology 01 natural sciences Pollution Salinity Isotopes engineering Environmental science Halite Water quality Drainage Cities Groundwater Water Pollutants Chemical 0105 earth and related environmental sciences Environmental Monitoring |
| Zdroj: | Environmental pollution (Barking, Essex : 1987). 283 |
| ISSN: | 1873-6424 |
| Popis: | The increasing salinization of groundwater renders it challenging to maintain the water quality. Moreover, knowledge regarding the characteristics and mechanism of groundwater salinization in mining areas remains limited. This study represents the first attempt of combining the hydrochemical, isotope (δD, δ18O, δ37Cl, and 87Sr/86Sr) and multivariate statistical analysis methods to explore the origin, control, and influence of fluoride enrichment in mining cities. The TDS content of groundwater ranged from 275.9 mg/L to 2452.0 mg/L, and 54% of the groundwater samples were classified as class IV water according to China's groundwater quality standards (GB/T 14848–2017), indicating a decline in the water quality of the study area. The results of the groundwater ion ratio and isotope discrimination analysis showed that dissolution and evaporation involving water-rock interactions and halite were the main driving processes for groundwater salinization in the study area. In addition to the hydrogeological and climatic conditions, mine drainage inputs exacerbated the increasing salinity of the groundwater in local areas. The mineral dissolution, cation exchange, and evaporation promoted the F− enrichment, while excessive evaporation and salinity inhibited the F− enrichment. Gangue accumulation and infiltration likely led to considerable F− enrichment in individual groundwater regions. Extensive changes in the groundwater salinity indicated differences in the geochemical processes that controlled the groundwater salinization. Given the particularity of the study area, the enrichment of salinization and fluoride triggered by mining activities cannot be ignored. |
| Databáze: | OpenAIRE |
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