摘要
采集与分析了20组松散岩类孔隙水样品,选取地下水中铁、锰、铵离子和硝酸盐作为分析指标。结果显示:丘陵及其边缘地段的潜水中铁离子、锰离子、铵离子和硝酸盐含量平均值分别为0.04 mg·L^(-1)、0.25 mg·L^(-1)、0.11 mg·L^(-1)和43.08 mg·L^(-1),平原区的承压水中各指标含量平均值分别为28.91 mg·L^(-1)、10.99 mg·L^(-1)、20.07 mg·L^(-1)和2.83 mg·L^(-1)。从地下水中各指标含量平均值来看,平原区承压水中的铁、锰和铵离子含量明显高于丘陵及其边缘地段的潜水,而平原区承压水中的硝酸盐含量则相对较低。研究发现,平原区承压水中的铁、锰和铵离子含量一般较高,主要是由原生环境形成的,形成与富集的主要影响因素为氧化还原环境、含水介质、矿化度、地下水径流条件等,其含量与COD、矿化度均呈现明显的正相关关系;丘陵及边缘地段的潜水中硝酸盐含量一般较高,是受到区内人类活动的影响。
Loose rock pore water samples are taken to be analyzed with iron,manganese,ammonium ions and nitrate of groundwater as analytical indexes.The statistic results show that the average contents of iron,manganese,ammonium ions and nitrate of the phreatic water are 0.04 mg·L^(-1),0.25 mg·L^(-1),0.11 mg·L^(-1) and 43.08 mg·L^(-1) respectively in hilly and their marginal areas,while the average contents of each index of the confined water are 28.91 mg·L^(-1),10.99 mg·L^(-1) 20.07 mg·L^(-1) and 2.83 mg·L^(-1) respectively in the plain areas.So the contents of iron,manganese and ammonium ions of the confined water in the plain areas are significantly higher than that of the phreatic water in hilly and their marginal areas,while the contents of nitrate of the confined water in plain areas are lower.The analysis shows that the contents of iron,manganese and ammonium ions of the confined water in the plain areas are generally high,which are mainly formed in the primary environment.The main influencing factors of their formation and enrichment are redox environment,aquifer medium,salinity,groundwater runoff conditions,etc.Their contents are positively correlated with COD and salinity.The contents of nitrate of the phreatic water are generally high due to the influence of human activities in hilly and their marginal areas.
作者
姚普
黄文龙
庄卓涵
YAO Pu;HUANG Wenlong;ZHUANG Zhuohan(Guangdong Institute of Geological Survey,Guangzhou 510080,Guangdong,China)
出处
《城市地质》
2022年第4期426-433,共8页
Urban Geology
基金
中国地质调查局“粤港澳湾区1:5万环境地质调查(三灶圩幅、飞沙幅)”项目(DD20160260-02)
“广州多要素城市地质调查”项目(DD20190291)联合资助。
关键词
地下水化学成分
铁
锰
铵
硝酸盐
chemical constituents in groundwater
iron
manganese
ammonium
nitrate
