井陉地区岩溶地下水水化学特征及其影响因素分析

基于2018年9月采集的24件丰水期地下水样品分析测试结果,综合运用数理统计、Piper三线图、相关性分析、Gibbs图和主要离子比值法等分析井陉地区岩溶地下水水化学特征及其影响因素。结果表明,岩溶地下水的主要阴阳离子为HCO3^-、SO4^2-、Ca^2+,水化学类型主要为SO4·HCO3-Ca、HCO3·SO4-Ca型;局部地区出现地下水点状污染,超标水点分布在工矿企业和农田等地区,主要影响指标为总硬度、硫酸盐和硝酸盐;地下水水化学主要受水岩作用控制,但也受人为因素、地下水径流方向及地表水影响。其中水岩作用主要以碳酸盐岩、硫酸盐岩和岩盐矿物风化溶解为主,也存在不同程度的阳离子交换作用;人为因素主要以工矿业污染为主。研究结果为井陉地区岩溶地下水污染防治提供了理论参考。

Hydrochemical Characteristics and Influencing Factors of Karst Groundwater in Jingxing Area

Based on the analysis and testing results of 24groundwater samples during the wet season in September 2018,the hydrochemical characteristics of the Karst groundwater in Jingxing area and its influencing factors were analyzed by using mathematical statistics,Piper three-line diagram,correlation analysis,Gibbs diagram and main ion ratio method.The results show that the main anions and cations of Karst groundwater are HCO3^-,SO4^2- and Ca^2+,and the hydrochemical types are mainly SO4·HCO3-Ca and HCO3·SO4-Ca.Groundwater point pollution occurs in some areas,and the water point exceeds the standard distributed in industrial and mining enterprises and farmland.The main impact indicators are total hardness,sulfate and nitrate.Groundwater hydrochemistry is mainly controlled by the action of water rocks,but also affected by human factors,groundwater runoff direction and surface water.The water-rock interaction mainly consists of weathering and dissolution of carbonate rock,sulfate rock and rock salt minerals,and there are also different degrees of cation exchange.Human factors are mainly caused by industrial and mining enterprises.The research results can provide a theoretical basis for prevention and control of Karst groundwater pollution in Jingxing area.