Mineralogical and hydrogeochemical insights into the distribution and source of groundwater fluoride in the southern Beijing plain

IF 5.9 1区 地球科学 Q1 ENGINEERING, CIVIL
Yanyan Li , Yuanyuan Chen , Hongrui Ding , Di Cui , Xiang Ji , Chuanye Zhou , Yan Li , Hongwei Jing , Anhuai Lu
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引用次数: 0

Abstract

Groundwater is a crucial water supply resource for Beijing, the capital of China. However, high fluoride (F) concentrations in groundwater have been reported previously on the southern Beijing Plain. In this study, F distribution in groundwater and aquifers of the southern Beijing Plain is comprehensively elucidated and its controlling factors are analyzed by integrating multiple approaches, including hydrogeochemical and isotopic analysis of groundwater, and chemical, lithological, and mineralogical studies of borehole sediment. Groundwater F concentrations ranged from 0.01 to 0.95 mg/L, and were below the permissible limit in drinking water recommended by the Chinese government (1.0 mg/L). Relatively high F− concentrations in groundwater were primarily distributed in the alluvial plain rather than those in alluvial fan. The spatial pattern of total F contents in the aquifer sediments was similar to that of groundwater F. The results of mineralogy, microstructure, and lithology also indicated that clay and F-bearing minerals (such as apatite, biotite, muscovite, fluorite, clinochlorite, and illite) in sediments provided geogenic sources of groundwater F. Various hydrogeochemical and mineralogical analyses provided corroborating evidence that sediment weathering (particularly silicates), dissolution of F-bearing minerals, and desorption from clay and iron (oxy)hydroxides were important processes that mobilize water-soluble and absorbed F into groundwater. Enrichment of groundwater F in the alluvial plain was attributed to high pH, groundwater flow path, long residence time, and the corresponding enhanced cation exchange of Ca2+ and Na+, reprecipitation of Ca2+, and substitution of F by OH under these conditions. Our findings highlight the combined effects of hydrogeochemical and mineralogical processes on F behavior in groundwater and have important implications for guiding the scientific control of high F groundwater.

Abstract Image

北京平原南部地下水氟化物分布及来源的矿物学和水文地球化学研究
地下水是中国首都北京的重要供水资源。然而,在北京平原南部,地下水中氟化物(F)浓度较高。综合地下水水文地球化学和同位素分析、钻孔沉积物化学、岩性和矿物学研究等多种方法,全面阐明了F在北京平原南部地下水和含水层中的分布,分析了其控制因素。地下水F -浓度范围为0.01 ~ 0.95 mg/L,低于中国政府建议的饮用水允许限量(1.0 mg/L)。地下水中较高的F−−浓度主要分布在冲积平原,而不是冲积扇。矿物学、微观结构和岩性分析结果也表明,沉积物中的粘土和含氟矿物(如磷灰石、黑云母、白云母、萤石、钙绿石和伊利石)是地下水F的地质来源。各种水文地球化学和矿物学分析提供了确凿的证据,证明沉积物风化(特别是硅酸盐),含氟矿物的溶解、黏土和铁(氧)氢氧化物的解吸是调动水溶性和吸收性氟进入地下水的重要过程。冲积平原地下水F的富集与高pH、水流路径、长停留时间以及相应的Ca2+和Na+阳离子交换增强、Ca2+的再沉淀和F−被OH−取代有关。研究结果揭示了水文地球化学和矿物学过程对地下水含氟行为的综合影响,对指导高含氟地下水的科学治理具有重要意义。
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来源期刊
Journal of Hydrology
Journal of Hydrology 地学-地球科学综合
CiteScore
11.00
自引率
12.50%
发文量
1309
审稿时长
7.5 months
期刊介绍: The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.
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