摘要
为查明廊坊地区天然高氟地下水的空间分布特征及形成机制,本研究分别采集廊坊平原区深层和浅层地下水样品76和100个,系统分析了高氟地下水分布、地下水氟来源及富集的水文地球化学作用。结果表明,研究区深层地下水氟离子浓度(平均值为1.65 mg·L^(-1))高于浅层地下水氟离子浓度(平均值为1.06 mg·L^(-1)),深、浅层地下水氟离子超标率分别为73.7%和40%。地下水中氟浓度随深度增加而增加。含水层中萤石溶解、方解石和白云石饱和沉淀有利于氟在深层地下水中的富集。偏碱性环境中含水层中氟离子解吸附和HCO_(3)^(-)竞争性吸附及阳离子交换吸附作用可进一步促进地下水中氟富集。蒸发浓缩作用对部分浅层高含氟地下水具有显著影响。同时,类似含氟矿物质和岩盐的溶解等各种地质过程也是地下水中氟富集的主要机制。
Natural high-fluoride groundwater is distributing in the Langfang Plain of China.To help ensure the water security of residents in this area,further research is needed to identify the spatial distribution characteristics and formation mechanisms of the high fluoride groundwater.In this study,76 and 100 deep and shallow groundwater samples were collected in the Langfang Plain,respectively.The pH,fluoride ions,major anions and cations in the groundwater samples were analyzed and tested to systematically analyze the distribution of high-fluoride groundwater,the fluoride source,and its hydrogeochemistry.The results show that fluorine concentrations in both deep and shallow groundwater exceeded the standard of 1.0 mg·L^(-1)at a rate of 73.7%and 40%,respectively.The groundwater fluorine concentrations increased with depth,showing higher concentrations in deep groundwater(median 1.65 mg·L^(-1))than in shallow groundwater(median 1.06 mg·L^(-1)).Fluorite dissolution in the aquifer is the main source of fluorine in the groundwater and the saturated precipitation of calcite and dolomite promotes fluorite dissolution,thus favoring fluorine enrichment in deep groundwater.The alkaline groundwater environment favors the desorption of F-in the aquifer and the competitive adsorption of HCO_(3)^(-)can further promote the accumulation of fluorine in groundwater.Cation exchange adsorption also promotes the accumulation of fluorine in deep groundwater.Evapotranspiration concentration has obvious effects in some shallow high-fluoride groundwater.At the same time,geological processes such as the dissolution of fluorine-containing minerals and rock salt are the main mechanisms for fluorine enrichment in deep groundwater.
作者
李堃正
白雪山
杜垚
张旭虎
朱小龙
靳潇锐
LI Kun-zheng;BAI Xue-shan;DU Yao;ZHANG Xu-hu;ZHU Xiao-long;JIN Xiao-rui(Geological Environment Monitoring Station of Hebei Province,Shijiazhuang 050021,China;Hebei Key Laboratory of Geological Resources Environment Monitoring and Protection,Shijiazhuang 050021,China)
出处
《生态与农村环境学报》
北大核心
2025年第4期496-505,共10页
Journal of Ecology and Rural Environment
基金
国家科技基础资源调查专项(2017FY100405)
河北省地质资源环境监测与保护重点实验室开放课题(JCYKT202202)。
关键词
地下水
氟
水文地球化学
分布特征
廊坊平原区
groundwater
fluoride
hydrological geochemistry
distribution characteristics
Langfang Plain
作者简介
通信作者:张旭虎,E-mail:122706274@qq.com;李堃正(1991-),男,河北三河人,高级工程师,主要从事水文地质和环境地质调查与研究工作。E-mail:jcylkz@163.com。
