| 蒲阳河流域地下水水化学及同位素特征 |
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| 引用本文： | 沈萌萌,郭华明,李晓萌,修伟,倪萍,张迪.蒲阳河流域地下水水化学及同位素特征[J].水文地质工程地质,2017,0(2):8-14. |
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| 作者姓名： | 沈萌萌 郭华明 李晓萌 修伟 倪萍 张迪 |
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| 作者单位： | 1.中国地质调查局水文地质环境地质调查中心, 河北 保定071051；2.河北地质大学 水资源与环境学院, 河北 石家庄050031；3. 河北省水资源可持续利用与开发实验室, 河北 石家庄050031 |
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| 基金项目： | 国家自然科学基金（41222020，41672225） |
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| 摘 要： | 保定西部山前地区位于太行山及华北平原交界带，为缓解极端气候灾害对生产生活的影响，维持地下水资源的可持续开发利用，开展相关的地下水水化学及同位素特征研究。研究区地下水化学类型以HCO3—Ca·Mg、HCO3·SO4—Ca·Mg及SO4·HCO3—Ca·Mg为主，区内地下水主要来源于大气降水，流域内地表水补给地下水；地下水中化学成分为Ca2＋、Mg2＋、HCO-3、SO2-4，主要来源于岩石风化作用，同时受到人类活动的影响，地下水中硝酸盐含量明显升高；由于受到褶皱构造的控制，流域的上游及平原区均出现年龄大于60年的地下水，多数岩溶水年龄较复杂，从现代水到大于60年的水均有分布。研究成果为流域内水资源的合理开发利用提供建议，区内岩溶地下水的开发将在一定程度上缓解极端天气的影响。
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| 关 键 词： | 蒲阳河流域 地下水 水化学特征 氢氧同位素 |
| 收稿时间： | 2016-10-08 |
| 修稿时间： | 2017-01-04 |
Characteristics of Fe oxide minerals and their roles in arsenic hydrogeochemistry in high arsenic aquifer sediments |
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| SHEN Mengmeng GUO Huaming,LI Xiaomeng,XIU Wei,NI Ping,ZHANG Di.Characteristics of Fe oxide minerals and their roles in arsenic hydrogeochemistry in high arsenic aquifer sediments[J].Hydrogeology and Engineering Geology,2017,0(2):8-14. |
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| Authors: | SHEN Mengmeng GUO Huaming LI Xiaomeng XIU Wei NI Ping ZHANG Di |
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| Affiliation: | 1.School of Water Resources and Environment, China University of Geosciences, Beijing100083, China;2.MOE Key Laboratory of Groundwater Circulation and Evolution, China University of Geosciences, Beijing100083, China |
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| Abstract: | Characteristics and reactivity of iron-bearing minerals control arsenic transfer and transformation in aquifer systems. In this study, aquifer sediments obtained from Inner Mongolia were investigated by kinetic experiments to study the connection between characteristics and reactivity of Fe-bearing minerals in aquifer sediments and As reactivity. Results showed that lithology controls the amount of total reactive Fe(Ⅲ) oxides (m0) in sediments. The value of m0 was 5.2 μmol/g in fine sand and 45 μmol/g in silty clay. The initial rate k′ values for both silty clay and fine sand were within the order of magnitude of 10-5 s-1. The value of parameter γ that characterizes heterogeneity of reactivity lay between synthetic Fe(Ⅲ) oxide minerals and shallow sediments. There may be two different Fe(Ⅲ) oxides in terms of reactivity in sediments: highly reactive Fe(Ⅲ) oxides and lowly reactive Fe(Ⅲ) oxides. Arsenic prefers to be adsorbed on the Fe(Ⅲ) oxides with high reactivity. In anoxic conditions, the reductive dissolution of Fe(Ⅲ) oxides with high reactivity in sediments led to arsenic release into groundwater. |
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