| 江汉平原砷中毒病区地下水砷形态季节性变化特征 |
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| 引用本文： | 邓娅敏,王焰新,李慧娟,李红梅,郭伟,段艳华,董创举,甘义群,刘乃静,丁旭峰.江汉平原砷中毒病区地下水砷形态季节性变化特征[J].地球科学,2015,40(11):1876-1886. |
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| 作者姓名： | 邓娅敏 王焰新 李慧娟 李红梅 郭伟 段艳华 董创举 甘义群 刘乃静 丁旭峰 |
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| 作者单位： | 1.中国地质大学地质调查研究院, 湖北武汉430074 |
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| 基金项目： | 国家自然科学基金项目41102153国家自然科学基金项目41120124003国家自然科学基金项目41472217中央高校基本科研业务费专项基金CUGL140412中央高校基本科研业务费专项基金CUG120113中国地调局地质调查子项目12120114069301科技部国合项目2014DFA20720 |
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| 摘 要： | 查明地下水中砷的时间变异性规律及机理是高砷地下水研究的难点和热点, 也是防控地下水砷污染的根本.选择在雨季前后对浅层潜水和孔隙承压水进行了动态监测.研究表明地下水砷含量和形态与地下水位波动存在明显的响应关系: 雨季开始后随着地下水位抬升, 地下水还原环境增强, As(Ⅴ)和Asp转化成As(Ⅲ), 颗粒态铁大幅降低, 导致水中溶解的砷和铁大幅增加, 地下水砷含量在雨季达到最高且As(Ⅲ)所占比例达到90%;雨季结束后随着水位逐渐降低, 地下水中As(Ⅲ)所占比例和溶解的砷含量下降.农业活动对浅层潜水砷形态季节性变化有明显的影响.孔隙承压水的砷形态分布变化较浅层潜水幅度大, 其变化与水位波动存在滞后效应.自然或人为活动引起的地下水位季节性变化改变了含水层的氧化还原环境, 补给水源与地下水之间的混合过程带来新的物质输入促进地下水系统中砷的迁移转化.
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| 关 键 词： | 砷形态 季节性变化 水位波动 氧化还原 江汉平原 地下水 地球化学. |
| 收稿时间： | 2015-01-26 |
Seasonal Variation of Arsenic Speciation in Shallow Groundwater from Endemic Arsenicosis Area in Jianghan Plain |
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| Abstract: | Understanding the seasonal variation of arsenic occurrence in shallow groundwater system is one of the challenges and hot spots concerning the research on high arsenic groundwater, which plays an important role in evaluation of safe groundwater availability and remediation of arsenic-affected aquifer. To investigate the seasonal variation of arsenic speciation in the shallow aquifer from the endemic arsenicosis area in the Jianghan plain, groundwater from shallow phreatic aquifer and unconfined aquifer were monitored for arsenic speciation (As(Ⅲ), As(Ⅴ) and acid-leacheable particulate As) and water level during pre-monsoon (May), monsoon (July-August) and post-monsoon (November-December) seasons. Arsenic concentration and speciation in groundwater varied temporally: the concentration of As(Ⅴ) and particulate As were higher, together with higher particulate Fe in most samples during the pre-monsoon seasons; As(Ⅴ) and particulate As decreased significantly during monsoon seasons, while dissovled As and Fe increased dramatically. Higher As concentrations were associated with an increasing percentage of As(Ⅲ) in rainy season and a decrease towards the end of dry season, indicating a reductive moblization responding to groundwater level fluctuation. |
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