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Enrichment mechanism and dynamic variation characteristics of fluorine and arsenic in groundwater of western Songnen Plain |
DENG Yuan-dong1,2, YE Xue-yan1,2, WU Ya-min1,2, DU Xin-qiang1,2 |
1. College of New Energy and Environment, Jilin University, Changchun 130021, China; 2. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China |
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Abstract In order to further reveal the the evolutionary trends of fluorine and arsenic in groundwater in the western part of the Songnen Plain, a comprehensive investigation was conducted on the current condition of fluorine and arsenic concentrations in groundwater, focusing on Tongyu County as a case study. Water quality data were analyzed using ion-ratio diagrams and self-organizing mapping networks. The results show that fluorine content of the phreatic water was governed by the precipitation and dissolution of the water-bearing medium, and evaporation and concentration had a certain influence on the formation of most of the shallow, high and low fluoride groundwater, but were not the dominant role in the formation of high fluoride groundwater. The dissolution of iron and manganese oxides from water promoted the release of As from shallow and deep groundwater. The overall level of the fluoride concentration in shallow groundwater in the mid-eastern part of the region has decreased since 1995, which may be attributed to factors such as the depletion of groundwater levels and decreased evaporation resulting from extensive local groundwater extraction. Although the deep, high fluoride groundwater did not show a significant change, its spatial coverage has expanded; This may be related to the leakage of shallow, high fluoride groundwater into the pressurized aquifers through the broken well pipes. The overall concentrations of arsenic in shallow groundwater in the central and northeastern regions from 1995to 2021 significantly exceed the WHO guideline values for drinking water. Although the concentrations of high-arsenic groundwater in deeper layers have remained relatively stable, they exhibit a wider distribution, more enriched zones, and greater contamination compared to high arsenic zone in shallow groundwater. This may be related to the reducing conditions in the pressurized aquifer that promoted the release of arsenic. Therefore, the exploitation of deep groundwater in Tongyu County should be conducted with cautions, taking into consideration of the areas affected by high levels of arsenic contamination. The exploitation level should be carefully determined to prevent the intrusion of polluted water. Additionally, attentions should be given to address the potentially cascading contaminations resulting from the leakage and destruction of wells.
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Received: 06 March 2023
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