华北地区城市地下水中主要离子含量升高机理分析——以洛阳市为例  

THE MECHANISM CONTROLLING THE VARIATIONS OF MAJOR IONS CONCENTRATION IN GROUNDWATER IN URBAN IN NORTH CHINA AREA——A CASE STUDY OF LUOYANG CITY

作　　者：蔡绪贻[1] 陈静生[1] 桂平 佘云平 

机构地区：[1]北京大学城市与环境学系,北京100871 [2]洛阳市公用事业局,洛阳471002 [3]中国地质大学环境科学系,北京100083

出　　处：《环境化学》1995年第5期393-401,共9页Environmental Chemistry

摘　　要：本文以洛阳市为例,讨论了华北地区地下水中主要离子的背景浓度及其形成作用;在此基础上,重点阐述了地下水中Ca^(2+)、Mg^(2+)浓度升高的若干机理;并对污染源各不相同的三个水源地地下水中Ca^(2+),Mg^(2+)浓度升高机理进行了定量分析;比较了Ca^(2+).Mg^(2+)浓度与其它主要离子浓度的相关特征.研究表明:该区两类地下水主要形成于钙长石和镁橄榄石的风化作用;地下水中CO_2分压升高,可促进Ca,Mg硅酸盐、铝硅酸盐的溶解,从而导致地下水中Ca^(2+),Mg^(2+)浓度升高.According to the observed data on ground water quality in recent thirty years, the authors analyzer the mechanisms causing the variation of major ion concentration in groundwater in Luoyang aquifer. The authors point out that two chemical kinds of groundwater in this aquifer are formed by the weathering process of anorthite and forsterite respectively,the authors stress that the CO2 partial pressure increase caused by groundwater contamination can accelarate the weathering process of silicate and alumi-nosilicate minerals which contain Ca2+ and Mg2+ , as a result, can increase the concentration of Ca2+ and Mg2+ in groundwater.

关 键 词：地下水 离子 硅酸盐 铝硅酸盐 风化作用 水污染 

分 类 号：X131[环境科学与工程—环境科学] X523.02