High fluoride (F⁻) concentration was detected in groundwater samples collected from three districts of the Brahmaputra valley of Assam, Nagaon, Kamrup Metropolitan (M) and West Karbi Anglong. The maximum F⁻ value of 9 mgL⁻¹ was found in southern Nagaon. About 38% of the total groundwater samples exceeded the WHO permissible limit of 1.5 mgL⁻¹. Petrographic analyses revealed that micaceous minerals such as biotite and muscovite are the dominant contributors of F⁻ in Nagaon and West Karbi Anglong; in Kamrup (M), it is biotite. The alkaline groundwater played a significant role in governing the dissolution and mobilization of F⁻ from its sources. Silicate weathering was more prominent in Nagaon and West Karbi Anglong, while carbonate weathering was dominant in samples collected from Kamrup (M). Both cationic (Ca²⁺/Na⁺) and anionic (F⁻/OH⁻) exchange processes occurred extensively across the studied hydrogeochemical regime. PHREEQC simulations revealed that fluorite and calcite undersaturation govern the F⁻ values in groundwater. This finding is well supported by the results of the dissolution experiment of rock samples, where powered samples (<600 μm) were mixed in ultrapure water (pH = 7) for 2000 h. A prominent variation, which ranged between 0.22 and 0.95 mgL⁻¹, was observed in the F⁻ concentration for Nagaon's rock sample solution. The experimental results gave a glimpse of real-time rock-water interaction scenarios in the study area, revealing Ca²⁺ removal processes to primarily govern F⁻ release into aquifers. A non-carcinogenic risk assessment study of F⁻ indicated a potential risk for the exposed population, especially, children in the study area.

高氟（F ^-从阿萨姆邦，纳加奥恩，Kamrup大都会（M）和西Karbi Anglong的雅鲁藏布江河谷的三个地区收集地下水样品中检测到的浓度）。最大值Fi ^- 9 MGL的值^-1在纳加奥恩南部被发现。地下水总量中约38％超过了WHO规定的1.5 mgL ^-1的限值。岩相分析表明，云母矿物如黑云母和白云母是F的主要贡献者^-在纳加奥恩和西部Karbi Anglong; 在坎普（M），它是黑云母。碱性地下水管理F的溶解和动员起了显著的作用^-从其来源。在长居和西卡比昂朗，硅酸盐风化作用更为突出，而从坎普（M）收集的样品中碳酸盐化风化作用最为明显。两个阳离子（钙²⁺ /钠⁺）和阴离子（F ^- / OH ^- ）交换过程广泛跨越研究水文政权发生。PHREEQC模拟显示，萤石和方解石欠饱和治理˚F ^-地下水数值。岩石样品溶解实验的结果很好地支持了这一发现，其中将动力样品（<600μm）与超纯水（pH = 7）混合2000 h。在F-中观察到明显的变化，范围在0.22至0.95 mgL ^-1之间^。Nagaon的岩石样品溶液的浓度。实验结果得到实时岩石-水交互场景一瞥研究区，露出的Ca ²⁺去除工艺，以主要管理˚F ^-释放到含水层。f的非致癌风险评估研究^-表明一个潜在的风险暴露人群，尤其是儿童的研究领域。