Abstract Groundwater is the main source of drinking water for residents of the Songnen Plain, and its high fluoride content affects the health of residents. Previous studies have revealed hydro-geological conditions for fluoride enrichment, but relatively little research has been done on hydrogeochemical processes. In this study, the analysis of the stable isotopes and the water chemistry of 444 groundwater samples showed that high-fluoride groundwater has the characteristics of high Na+ and high HCO3−, and the pH is neutral to weakly alkaline. Geochemical analysis revealed that fluorite in the sedimentary layer is the main source of fluoride in the groundwater. In addition, the concentration of F− is related to the alkaline environment, human activity, fluorite solubility, cation exchange, and silicate weathering. The relationship between δ18O and F− indicates that evaporation does not have a notable effect on F− enrichment. Hydrogen and oxygen isotope analysis, combined with previous survey results on the groundwater circulation in Songyuan, show that the increase of the F− concentration in the Quaternary confined aquifer is either related to submerged overflow or to the destruction of the aquifer structure, due to artificial abstraction, indicating the effects of water cycle on the diffusion of F− between different aquifers.

中文翻译：

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水化学和同位素法测定东北松原地下水中氟的分布及影响因素

摘要 地下水是松嫩平原居民饮用水的主要来源，其高氟含量影响居民健康。以前的研究揭示了富集氟化物的水文地质条件，但对水文地球化学过程的研究相对较少。本研究对444个地下水样品的稳定同位素和水化学分析表明，高氟地下水具有高Na+、高HCO3−的特点，pH为中性至弱碱性。地球化学分析表明，沉积层中的萤石是地下水中氟化物的主要来源。此外，F−的浓度与碱性环境、人类活动、萤石溶解度、阳离子交换和硅酸盐风化有关。δ18O 和 F− 之间的关系表明蒸发对 F− 富集没有显着影响。氢氧同位素分析结合松原地下水环流调查结果表明，第四纪承压含水层中F-浓度的增加要么与淹没溢流有关，要么与人工造成的含水层结构破坏有关。抽象，表明水循环对不同含水层之间 F− 扩散的影响。