Abstract：
Fluoride-enriched groundwater is a serious threat for groundwater supply around the world. The medium-low temperature fluoride-enriched geothermal groundwater resource is widely distributed in the circum-Wugongshan area. And the fluoride concentration of all geothermal samples exceeds the WHO permissible limit of 1.5 mg/L. The Self-Organizing Map method, hydrochemical and isotopic analysis are used to decipher the driving factors and genetic mechanism of fluoride-enriched geothermal groundwater. A total of 19 samples collected from the circum-Wugongshan geothermal belt are divided into four clusters by the self-organizing map. Cluster I, Cluster II, Cluster III, and Cluster IV represent the geothermal groundwater with the different degree of fluoride concentration pollution, the different hydrochemical type, and the physicochemical characteristic. The high F- concentration geothermal groundwater is characterized by HCO3-Na with alkalinity environment. The δD and δ18O values indicate that the geothermal groundwater origins from the atmospheric precipitation with the recharge elevation of 1000-2100 m. The dissolution of fluoride-bearing minerals is the main source of fluoride ions in geothermal water. Moreover, groundwater fluoride enrichment is also facilitated by water-rock interaction, cation exchange and alkaline environment. Additionally, the health risk assessment result reveals that the fluorine-enriched geothermal groundwater in the western part of Wugongshan area poses a more serious threat to human health than that of eastern part. The fluoride health risks of geothermal groundwater for different group show differentiation, 100% for children, 94.74% for adult females, and 68.42% for adult males, respectively. Compared with adult females and adult males, children faced the greatest health risks. The results of this study provide scientific evaluation for the utilization of geothermal groundwater and the protection of human health around the Wugongshan area.
摘要：
富氟地下水是全球地下水供应的严重威胁。中低温富氟地热地下水资源广泛分布于武功山地区。并且所有地热样品的氟化物浓度超过WHO允许的1.5mg/L的限值。自组织映射方法，水化学和同位素分析用于破译富含氟的地热地下水的驱动因素和遗传机制。从环武功山地热带收集的19个样品通过自组织图分为四个簇。群集I,ClusterII,第三组,第四组代表不同氟浓度污染程度的地热地下水，不同的水化学类型，和物理化学特征。高浓度F-地热地下水的特征是HCO3-Na具有碱性环境。δD和δ18O值表明，地热地下水起源于大气降水，补给海拔为1000-2100m。含氟矿物的溶解是地热水中氟离子的主要来源。此外，水-岩石相互作用也促进了地下水氟化物的富集，阳离子交换和碱性环境。此外,健康风险评价结果表明，武功山地区西部地区富氟地热地下水对人体健康的威胁比东部地区更为严重。不同群体的地热地下水氟化物健康风险呈现分化,100%为儿童成年女性94.74%，成年男性占68.42%，分别。与成年女性和成年男性相比，儿童面临最大的健康风险。本研究结果为武功山地区地热地下水的利用和保护人类健康提供了科学评价。
