中山市地下水饮用水源地及其周边水化学特征及形成机制  

Hydrochemical characteristics and formation mechanism of potable groundwater sources in Zhongshan City and its surroundings

作　　者：胡启智 曾经文 丘锦荣 林晓君 康迪 王秀娟 刘人涛 刘娜[4] HU Qizhi;ZENG Jingwen;QIU Jinrong;LIN Xiaojun;KANG Di;WANG Xiujuan;LIU Rentao;LIU Na(Guangdong Hydrogeology Battalion,Guangzhou 510510,China;South China Institute of Environmental Sciences,Ministry of Ecology and Environment of the People s Republic of China,Guangzhou 510655,China;School of Environment,Jinan University,Guangzhou 510632,China;College of Life Science and Technology,Jinan University,Guangzhou 510632,China)

机构地区：[1]广东省水文地质大队,广州510510 [2]生态环境部华南环境科学研究所,广州510655 [3]暨南大学环境学院,广州510632 [4]暨南大学生命科学技术学院,广州510632

出　　处：《世界地质》2024年第1期143-152,共10页World Geology

基　　金：国家重点研发计划子课题(2018YFC1800304)。

摘　　要：为了探究地下水饮用水源地水质现状,运用数理统计、piper图、Gibbs图、环境背景值统计等方法研究中山市地下水饮用水源地及其周边水化学特征及形成机制。结果表明,研究区内地下水呈现弱酸性和低矿化度,Na^(+)和HCO_(3)^(-)是地下水中主要离子,水化学类型以HCO_(3)-Na·Ca型为主。水化学组成受大气降雨-岩石风化联合作用,阳离子交换作用较为强烈。长期大量的酸雨、包气带土壤及含水层对酸沉降的缓冲能力较差和碱土金属、CO_(2)以及碳酸盐的水解是造成地下水pH值降低的主要原因。To investigate the current water quality of potable groundwater sources,this paper utilizes methods such as mathematical statistics,Piper diagrams,Gibbs diagrams,and environmental background value statistics to study the hydrochemical characteristics and formation mechanism of groundwater drinking sources in Zhongshan City and its surroundings.The results show that the groundwater in the study area is weakly acidic and low in mineralization,with Na^(+) and HCO_(3)^(-) being the main ions.The hydrochemical type is predominantly HCO_(3)-Na·Ca.The chemical composition of the water is influenced by the combined effects of atmospheric precipitation and rock weathering,with a strong cation exchange reaction.The main reasons for the decrease in groundwater pH value are the long-term abundance of acid rain,the poor buffering capacity of the soil and aquifer in the vadose zone against acid deposition,and the hydrolysis of alkaline earth metals,CO_(2) and carbonates.

关 键 词：地下水水源地 水化学特征 水文地球化学过程 成因 

分 类 号：P641.3[天文地球—地质矿产勘探]