doi:10.12202/j.0476-0301.2020190郑世达^1,,
苏小四^1,,,
车巧慧¹,
李云峰²
1.吉林大学水资源与环境研究所，130021，吉林长春
2.中国地质调查局南京地质调查中心，210016，江苏南京
基金项目:中国地质调查局地质调查项目（DD20189250）

详细信息

通讯作者:苏小四（1971-），男，安徽巢湖人，教授，博士研究生导师. 研究方向：水文地球化学. e-mail：suxiaosi@163.com

中图分类号:P641.3

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出版历程

收稿日期:2020-05-14
网络出版日期:2021-01-09
刊出日期:2020-12-01

Hydrochemistry and evolution of high arsenic groundwater in the plain along the Changjiang River (Anqing Reach)

Shida ZHENG^1,,
Xiaosi SU^1,,,
Qiaohui CHE¹,
Yunfeng LI²
1. Institute of Water Resources and Environment, Jilin University, 130012, Changchun, Jilin, China
2. Nanjing Geological Survey, China Geological Survey, 210016, Nanjing, Jiangsu, China



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摘要
摘要:在对安庆沿江平原地下水和沉积物开展地球化学特征研究的基础上，分析典型地下水流路径上地下水化学演化过程，揭示了该地区高砷(As)地下水的成因．研究结果表明：研究区潜水中总As质量浓度明显高于承压水，高As地下水赋存于弱碱性还原环境中，主要分布在冲-洪积和冲-湖积过渡区．地下水高As区含水介质中有效态As质量浓度明显高于地下水低砷区，有效态As主要以铁锰氧化物结合态和碳酸盐吸附态形式存在．典型地下水流路径的水化学特征显示，从补给区到排泄区，地下水逐渐演化为弱碱性还原环境，铁氧化物发生还原性溶解引起吸附在含水介质表面或晶格里As的释放是区内高As地下水形成的重要原因．
关键词:沿江平原/
高砷地下水/
沉积物/
地球化学过程
Abstract:Anqing, an important node in the Changjiang River Economic Zone, has been found in recent years to have high arsenic concentrations in groundwater, but nothing is known about the reasons of such high-arsenic levels．Chemical evolution of groundwater along typical groundwater flow path was analyzed here to reveal the cause of high arsenic．Arsenic concentration in un-confined water was found to be significantly higher than in confined water in the transition zone of alluvial-flood and alluvial-lake．Content of available arsenic in the medium in high-arsenic area was found to be significantly higher than in the low-arsenic area, as iron and manganese oxide or in carbonate adsorption state．From a typical groundwater flow path it was obvious that from the recharge area to the discharge area, groundwater gradually evolved into a weakly alkaline reducing environment．Release of arsenic adsorbed on surface of aqueous medium or crystal lattice due to reductive dissolution of iron oxides is confirmed to be a major reason for high arsenic concentrations in groundwater．
Key words:plain along the Changjiang River/
high arsenic groundwater/
sediment/
geochemical process