| 内蒙古河套平原典型高砷区地下水中砷的演化规律 |
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| 引用本文： | 张扬,郭华明,贾永峰,张卓.内蒙古河套平原典型高砷区地下水中砷的演化规律[J].水文地质工程地质,2017,0(2):15-22. |
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| 作者姓名： | 张扬 郭华明 贾永峰 张卓 |
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| 作者单位： | 1.浙江广川工程咨询有限公司，浙江 杭州310020；2.中国地质大学（北京）水资源与环境学院，北京100083；3.中国环境科学研究院，北京100012 |
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| 基金项目： | 国家自然科学基金（41222020，41672225） |
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| 摘 要： | 通过对高砷地下水典型区完整地质单元不同深度含水层地下水进行监测，分析了与砷释放、迁移和富集有关的敏感因素（水位、Eh、总铁、亚铁等）的时间和空间变化规律，探讨了高砷地下水的形成机理。结果发现，地下水灌溉区和黄河水灌溉区，地下水水位均受人为灌溉活动的影响。地下水砷含量在空间和时间尺度上发生有规律的变化。在空间尺度上，地下水中砷含量随着深度的增加而升高，井深小于10 m的地下水砷含量在1.88～2.58 μg/L；井深在10~15 m之间的地下水中砷含量在18.2～217 μg/L；井深在15~25 m之间的地下水中砷含量在38.3～226 μg/L。受人为灌溉影响，地下水中砷的含量会随着地下水位的抬升而升高。地下水砷含量随时间变化的原因是水位抬升使水位变化造成氧化还原环境改变。地下水系统中含砷铁氧化物矿物的还原性溶解、脱硫酸作用等是控制地下水砷含量的主要水文地球化学过程。
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| 关 键 词： | 高砷地下水 含水层 地下水位 时间 空间 |
| 收稿时间： | 2016-10-08 |
| 修稿时间： | 2017-01-08 |
Geochemical evolution of high arsenic groundwater in a typical area of the Hetao Basin,Inner Mongolia |
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| ZHANG Yang,GUO Huaming,JIA Yongfeng,ZHANG Zhuo.Geochemical evolution of high arsenic groundwater in a typical area of the Hetao Basin,Inner Mongolia[J].Hydrogeology and Engineering Geology,2017,0(2):15-22. |
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| Authors: | ZHANG Yang GUO Huaming JIA Yongfeng ZHANG Zhuo |
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| Affiliation: | 1.Zhejiang Guangchuan Engineering Consulting Co. Ltd., Hangzhou, Zhejiang310020, China; 2.School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing100083,China;3.Chinese Research Academy of Environmental Sciences, Beijing100012,China |
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| Abstract: | Based on monitoring of groundwater levels and chemical conponents at different aquifers in a typical hydrogeological section of the Hetao basin, spatial and temporal variations in As, redox-sensitive parameters (including Eh, total dissolved Fe, Fe(Ⅱ)) were assessed, and the formation mechanisms of high As groundwater were evaluated. Results showed that groundwater levels were affected by agricultural irrigation in both groundwater irrigation area and surface water irrigation area. Spatial and temporal variations of groundwater As were observed. Spatially, groundwater As concentrations increased with the increasing sampling depths. In aquifers at depths <10 m, groundwater As was less than 5.0 μg/L, between 18.2 and 217 μg/L at depths 10~15 m, and between 38.3 and 226 μg/L at depths 15~25 m. Affected by agricultural irrigation, groundwater As generally increased with the increase in groundwater levels. The reason for the increases in As concentrations with increasing water levels is that the fluctuation of groundwater level induced the change of groundwater redox conditions. The major hydrogeochemical processes controlling groundwater As concentrations included reductive dissolution of Fe(Ⅲ) oxides and bacterial sulfate reduction. |
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