摘要
张家口坝上地区存在高氟地下水,对当地居民饮用水安全造成潜在危害.本文基于坝上地区299组潜水(井深≤50 m)样品的水质分析结果,通过反距离权重插值法,结合ArcGIS软件对研究区地下水氟的空间分布进行分析;通过统计分析法、水化学分析法、地球化学模拟等方法进行水化学特征与高氟地下水成因分析.结果表明:研究区水化学类型以HCO_(3)-Ca型、HCO_(3)-Mg型、Cl·HCO_(3)-Na型为主,水化学组分主要受岩石风化溶解作用影响;地下水氟的空间分布从补给区到低洼地带的排泄区呈逐渐增大的趋势,高氟地下水(ρ(F-)>1.5 mg·L^(-1))广泛分布于康保县南部和尚义县北部地区的洼地排泄区、沽源县西北部的湖淖排泄区以及张北县北部的隐伏玄武岩地区;含氟矿物的水岩相互作用与离子交换作用是研究区高氟地下水形成的主要机制;蒸发浓缩作用、蒸发岩(如岩盐、石膏)的溶解、含钙矿物(如方解石、白云石)的沉淀以及碱性环境黏土矿物表面的吸附解吸过程都是坝上地区地下水F-富集的主要控制因素.
Groundwater in the Bashang region of Zhangjiakou has high-fluoride(F)levels,posing potential hazard to local residents.Here a total of 299 samples of shallow groundwater(well depth less than 50 m)were taken and analyzed.Spatial distribution of high F groundwater was subject to Arcgis analysis with inverse distance weight interpolation.Statistical analysis,hydrochemical analysis and hydrogeochemical simulation were applied to study the hydrochemical characteristics and to elucidate formation mechanism of high-F groundwater.Hydrochemical compositions were found to be mainly affected by rock-weathering,with HCO_(3)-Ca,HCO_(3)-Mg and Cl·HCO_(3)-Na being the dominant groundwater types in the study area.Fluoride level in groundwater was found to increase gradually from recharge area to discharge area in low-lying areas.High-F groundwater was present in low-lying discharge areas in the southern part of Kangbao County and northern part of Shangyi County,in lake-morass discharge areas in northwestern of Guyuan County,and in concealed basalt areas in northern part of Zhangbei County.Interactions between F-bearing minerals and groundwater,and ion exchanges were identified to be the primary mechanisms for the formation of high-F groundwater.Moreover,evaporation-crystallization process,dissolution of evaporites(e.g.,halite and gypsum),precipitation of carbonates(e.g.,calcite and dolomite),absorption-desorption process which occurred on the surface of clay minerals under alkaline environment were found to be the main controlling factors for F-enrichment in the aquifers in the Bashang region.
作者
李予红
宋晓光
胡斌
南贵军
芦岩
梁仕凯
LI Yuhong;SONG Xiaoguang;HU Bin;NAN Guijun;LU Yan;LIANG Shikai(Land and Resources Exploration Center of Hebei Bureau of Geology and Mineral Resources Exploration,050081,Shijiazhuang,Hebei,China;State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Science Chinese Academy of Sciences,100085,Beijing,China;University of Chinese Academy of Sciences,100049,Beijing,China)
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第6期745-755,共11页
Journal of Beijing Normal University(Natural Science)
基金
河北省国土资源厅下达项目(2013995431)。
关键词
高氟地下水
分布特征
水岩相互作用
离子交换作用
坝上地区
high-fluoride groundwater
distribution characteristics
water-rock interaction
ion exchange
Bashang region
