衡水市桃城区浅层高氟地下水水化学特征与成因分析  

Hydrochemical Characteristics and Genetic Analysis of Shallow High-fluorine Groundwater in Taocheng District,Hengshui City

作　　者：张怀胜 蔡五田[1] 边超[1] 刘金巍[1] ZHANG Huai-sheng;CAI Wu-tian;BIAN Chao;LIU Jin-wei(Center for Hydrogeology and Environmental Geology Survey, CGS, Baoding 071051, China)

机构地区：[1]中国地质调查局水文地质环境地质调查中心,保定071051

出　　处：《科学技术与工程》2021年第24期10191-10198,共8页Science Technology and Engineering

基　　金：国家基础资源调查专项课题(2017FY100401);国家科技重大水专项子任务(2018ZX07109-001-02)。

摘　　要：为研究衡水市桃城区浅层含氟地下水化学特征与成因演化过程,对桃城区浅层地下水进行了野外调查与取样测试。结果表明:桃城区浅层地下水以Cl·SO_(4)型为主,高氟水多见于HCO_(3)·Cl型水中,且分布于研究区南侧。F^(-)与HCO_(3)^(-)在相关性分析中体现出显著正相关,与Ca^(2+)和Mg^(2+)存在负相关。在研究区因气候条件创造的强蒸发、碱性环境下,F^(-)主要来源于矿物的溶解。石膏与萤石在研究区地层中处于较为稳定的溶解态,为地下水提供了F^(-)与Ca^(2+),环境中偏高的HCO_(3)^(-)含量同样有利于F^(-)在碱性环境下解吸。综上所述,桃城区浅层地下水化学特征受溶滤作用、蒸发浓缩和离子交替与解吸作用共同影响,水体中含氟矿物CaF_(2)的溶解平衡与阴阳离子的交替吸附作用是桃城区地下水F^(-)含量变化的主要控制因素。In order to study the chemical characteristics and genetic evolution process of shallow fluorine-containing groundwater in Taocheng District,field investigation and sampling test were carried out on shallow groundwater.The result shows that the shallow groundwater in Taocheng District is mainly Cl·SO_(4) type,and the high fluoride water is distributed south of the study area and is more common in HCO_(3)·Cl type water.F-has a significant positive correlation with HCO_(3)^(-) and is negatively correlated with Ca2+and Mg^(2+).In the strong evaporation and alkaline environment created by climatic conditions in the study area,F-is mainly derived from the dissolution of minerals.Gypsum and fluorite are in a relatively stable dissolved state continuously providing F-and Ca^(2+) for groundwater.The high HCO_(3)^(-) content is also conducive to F-desorption in alkaline environments.In summary,the chemical characteristics of shallow groundwater in Taocheng District are affected by the combined effects including leaching effect,evaporation concentration and ion exchange-desorption.The dissolution equilibrium of CaF_(2) and ion exchange-desorption are the main controlling factors for the change of groundwater F-content in Taocheng District.

关 键 词：衡水市桃城区 高氟地下水 水化学特征 影响因素 

分 类 号：P641[天文地球—地质矿产勘探]