丰县浅层高氟地下水化学特征及富集机理  

Hydrochemical Characteristics and Enrichment Mechanism of Shallow High Fluorine Groundwater in Feng County

作　　者：周娇 陈菁[1] 王收 赵祥宇 陈丹[1] 代小平[1] ZHOU Jiao;CHEN Jing;WANG Shou;ZHAO Xiangyu;CHEN Dan;DAI Xiaoping(College of Agricultural Science and Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学农业科学与工程学院,南京211100

出　　处：《地球与环境》2024年第1期122-132,共11页Earth and Environment

基　　金：江苏省水利科技项目(2021056);中央高校基本科研业务专项资金(B220201019)。

摘　　要：丰县地区浅层地下水F^(-)浓度超标,对农村居民饮水健康造成威胁。为保障农村饮水安全,结合piper图、Gibbs图、离子比值分析等常规水化学方法和同位素水化学方法,探索研究区浅层高氟地下水的F^(-)浓度分布特征和富集机理。结果表明:研究区浅层地下水F^(-)浓度在0.21~5.52 mg/L之间,整体呈现东北高、西南低的趋势。高氟地下水占75%,呈弱碱性环境,主要水化学类型为Na-SO_(4)-Cl型。浅层地下水的F^(-)富集主要受水岩交互作用控制,弱碱性环境提供的OH^(-)促进F^(-)解吸,萤石溶解、白云石和方解石沉淀以及阳离子交换作用促进F^(-)释放。此外,农业灌溉和工业污水排放等人为因素对浅层地下水F^(-)浓度影响较大。蒸发浓缩作用和农业施肥仅影响部分地区F^(-)的富集。The excessive F^(-)concentration of shallow groundwater is a serious problem in Feng County,which poses a threat to the drinking water health of rural residents.To ensure the safety of rural drinking water,the F^(-)distribution characteristics and enrichment mechanism of shallow groundwater were explored by combining conventional water chemistry methods such as piper diagram,Gibbs diagram,ion ratio analysis and isotope water chemistry methods.The results showed that the F^(-)concentration of shallow groundwater in the study area ranged from 0.21 to 5.52 mg/L,with an overall trend of high in the northeast and low in the southwest.Highly fluoridated groundwater accounted for 75% of the total,with a weakly alkaline environment,and the main water chemistry type was Na-SO_(4)-Cl type.The F^(-)enrichment of shallow groundwater is mainly controlled by water-rock interaction,with fluorite dissolution,dolomite and calcite precipitation and cation exchange promoting the release of F^(-).The weak alkaline environment provides OH^(-)to promote F^(-)desorption.Anthropogenic factors such as agricultural irrigation and industrial effluent discharge have a strong influence on shallow groundwater F^(-)concentration.Evaporation concentration and agricultural fertilization only affect the enrichment of F^(-)in individual areas.

关 键 词：丰县 高氟地下水 浅层地下水 水化学特征 富集机理 

分 类 号：P641.3[天文地球—地质矿产勘探]