新疆若羌县绿洲区地下水氟硼来源解析及其风险评价OA

Groundwater quality in Ruoqiang County,situated on the southern margin of the Taklimakan Desert,is critical to sustaining local livelihoods,economic production,ecological stability,and high-quality development.This study analyzed 30 groundwater samples collected from Ruoqiang Oasis from 2023 to 2025 to investigate its hydrochemical characteristics and compositional controlling factors.The absolute principal component score-mul-tiple linear regression model was employed to identify the source of fluoride and boron in the groundwater.The groundwater quality was assessed using the entropy-weighted water quality index.A health risk assessment mod-el was applied to quantify the risks posed to different demographic groups by the fluoride and boron in drinking water.The findings of this study are as follows:(1)Groundwater in the study area is predominantly neutral to weak-ly alkaline.Fluoride and boron exceedance rates are 61.54%and 82.35%in single-structure phreatic water,and 0.00%and 29.41%in multi-structure phreatic-confined water,respectively.The hydrochemical facies are mainly Cl∙SO4-Na and Cl∙SO4-Na∙Ca,governed by evaporation concentration,rock weathering,and cation exchange.(2)Weathering and dissolution of boron-bearing silicate minerals and fluorite are the major sources of fluoride and boron.The groundwater chemical composition is primarily influenced by leaching and enrichment(71.76%),followed by primary geological conditions(13.32%)and anthropogenic activities(8.43%).(3)The groundwater quality exhibits a deteriorating trend over time,with fluoride posing a substantially higher health risk than boron,particularly to children.Mitigating fluoride concentrations is essential to reducing health risks in the region.