河西堡化工园区地下水化学特征与高氟水成因机制  

Hydrochemical characteristics and formation mechanism of high-fluorine groundwater in the Hexibu chemical industrial park

作　　者：李玉山 李惠平 王虎 周彦兆 何泽林 LI Yushan;LI Huiping;WANG Hu;ZHOU Yanzhao;HE Zelin(Hydrogeological Engineering Geological Prospecting Institute,Gansu Provincial Bureau of Geology and Minerals Exploration and Development,Zhangye 734000;Key Laboratory of Groundwater Engineering and Geothermal Resources in Gansu Province,Lanzhou 730000,China)

机构地区：[1]甘肃省地质矿产勘查开发局水文地质工程地质勘察院,张掖734000 [2]甘肃省地下水工程及地热资源重点实验室,兰州730000

出　　处：《干旱区资源与环境》2022年第12期119-126,共8页Journal of Arid Land Resources and Environment

基　　金：第二次青藏高原综合科学考察研究(2019QZKK0904)资助。

摘　　要：为促进河西堡化工园区的高质量建设和当地经济发展,通过野外调查、水化学样品采集测试、统计分析、Piper图、Gibbs模型、氯碱指数、反向水文地球化学模拟等方法,分析了园区地下水化学特征与高氟水成因机制。结果表明,园区地下水水化学类型主要为SO_(4)·Cl-Na和SO_(4)·Cl-Ca·Mg型水,劣质组分主要为TDS、F-、SO_(4)^(2-)、Cl^(-)。地下水中F-含量为0.23~5.23mg·L^(-1),呈东北高、西南低的分布格局。高氟地下水占比达76.5%,主要分布于pH为7.56~8.25的弱碱性地下水中,水化学类型为SO_(4)·Cl-Na型。高氟地下水的成因主要受控于含氟矿物的风化溶解与阳离子交换作用,次要控制因素为吸附解吸作用、蒸发浓缩作用及含钙矿物的沉淀,人类活动对高氟地下水的形成影响较小,研究成果对园区地下水开发利用和饮水安全具有指导意义。To promote the high-quality construction and local economic development of Hexibu chemical industrial park,field investigation,water chemical testing,statistical analysis,Piper diagram,Gibbs model,chlor-alkali index and reverse hydrogeochemical modeling were used to analyze the hydrochemical characteristics and formation mechanism of high-fluorine groundwater in the park.The results show that the hydrochemical types of groundwater in the park are mainly SO_(4)·Cl-Na and SO_(4)·Cl-Ca·Mg,and the inferior components are mainly TDS,F^(-),SO_(4)^(2-),Cl^(-).The F^(-)content of groundwater in the park is 0.23-5.23mg·L^(-1),and the F-concentration of groundwater in the park is generally higher in the northeast and lower in the southwest.The proportion of high-fluorine groundwater is 76.5%,which is mainly distributed in the weakly alkaline groundwater with pH value ranging from 7.56 to 8.25,and its hydrochemical type is mainly SO_(4)·Cl-Na.The dissolution of fluorine-containing minerals and ion exchange are the main formation mechanisms of high-fluorine groundwater.Evaporation,adsorption and desorption,and precipitation of calcium-bearing minerals are the secondary controlling factors for F-enrichment in groundwater.Human activities have little impact on the formation of high-fluorine groundwater.The study results have guiding significance for the rational exploitation and utilization of groundwater in the park and the safety of regional drinking groundwater.

关 键 词：高氟地下水 分布特征 水化学特征 成因机制 河西堡 

分 类 号：X523[环境科学与工程—环境工程]