牟汶河中上游孔隙水化学特征及控制因素  

Hydrochemical Characteristics and Control Factors of Pore-water in the Middle and Upper Reaches of Muwen River

作　　者：刘元晴 周乐[2] 吕琳[2] 李伟[2] 王新峰[2] 邓启军[2] 郑一迪 李常锁 LIU Yuan-qing;ZHOU Le;LÜLin;LI Wei;WANG Xin-feng;DENG Qi-jun;ZHENG Yi-di;LI Chang-suo(801 Institute of Hydrogeology and Engineering Geology,Shandong Provincial Bureau of Geology&Mineral Resources,Ji'nan 250014,China;Center for Hydrogeology and Environmental Geology Survey,China Geological Survey,Baoding 071051,China)

机构地区：[1]山东省地质矿产勘查开发局八〇一水文地质工程地质大队,济南250014 [2]中国地质调查局水文地质环境地质调查中心,保定071051

出　　处：《环境科学》2023年第3期1429-1439,共11页Environmental Science

基　　金：国家自然科学基金项目(41240021);山东省地下水环境保护与修复工程技术研究中心(筹)开放基金项目(KJS-21-0012);中国地质调查局地质调查项目(DD2022175403,DD20190259,DD20160289)。

摘　　要：为研究牟汶河中上游孔隙水水化学特征及离子来源,在牟汶河中上游莱芜盆地采集了孔隙水样品29组,综合利用相关性和主成分分析、Piper三线图和Gibbs图集离子比值等方法,分析了该区孔隙水主要离子特征及其控制因素,揭示了该区孔隙水中的主要物质来源.结果表明,牟汶河中上游孔隙水阴阳离子以HCO_(3)^(-)、NO_(3)^(-)、SO_(4)^(2-)和Ca^(2+)为主;以TDS>1000 mg·L^(-1)为标准,正常值点水化学类型主要为HCO_(3)·NO_(3)·SO_(4)-Ca和HCO_(3)·SO_(4)-Ca·Mg型水,异常值点水化学类型主要为NO_(3)·Cl^(-)Ca型水.地下水化学演化过程主要受岩石风化、阳离子交替吸附和人类活动影响,Na++K+主要来自硅酸盐风化溶解作用,HCO_(3)^(-)、Ca^(2+)和Mg^(2+)来自以方解石为主要矿物的碳酸盐岩风化及碳酸和硫酸参与的溶解作用;阳离子交替吸附与硅酸盐岩的风化作用为孔隙水提供了盈余的Ca^(2+)和Mg^(2+);生活污水混入、农业种植活动和铁矿煤矿开采等工矿活动改变着孔隙水化学成分,特别是NO_(3)^(-)超标现象,已成为当地地下水化学环境的主要问题.In order to study the hydrochemical characteristics and ion sources of pore water in the middle and upper reaches of the Mouwen River,29 groups of pore-water samples were collected in the Laiwu Basin.The main ion characteristics and their controlling factors of pore-water in this area were analyzed by using correlation and principal component analysis,Piper trigram,and Gibbs diagram methods.The main material sources of pore water in this area were revealed.The results showed that HCO_(3)^(-),NO_(3)^(-),SO_(4)^(2-),and Ca^(2+)were the main anions and cations in the pore water of the middle and upper reaches of the Mouwen River.With TDS>1000 mg·L^(-1)as the standard,the normal water chemistry type was mainly HCO_(3)·NO_(3)·SO_(4)-Ca and HCO_(3)·SO_(4)-Ca·Mg,whereas the abnormal water chemistry type was mainly NO_(3)·Cl^(-)Ca.The chemical evolution of groundwater was mainly influenced by rock weathering,cation alternation adsorption,and human activities.Na++K+mainly came from silicate weathering and dissolution,and HCO_(3)^(-),Ca^(2+),and Mg^(2+)came from calcite weathering and dissolution involving carbonate and sulfuric acid.Alternation adsorption of cations and weathering of silicate rock provided a surplus of Ca^(2+)and Mg^(2+)for pore water.Industrial and mining activities such as domestic sewage mixing,agricultural planting activities,and iron and coal mining changed the chemical composition of pore water,especially NO_(3)^(-)exceeding the standard,which has become the main problem of the local groundwater chemical environment.

关 键 词：牟汶河 离子来源 水化学 化学风化 水文地质 

分 类 号：X143[环境科学与工程—环境科学]