Arsenic releasing mechanisms during clayey sediments compaction: An experiment study
Arsenic releasing mechanisms during clayey sediments compaction: An experiment study
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粘土沉积物压实过程中砷的释放机制：实验研究
DOI：
10.1016/j.jhydrol.2020.125743
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发表时间：
2020-11
影响因子：
6.4
通讯作者：
Yao Du
中科院分区：
文献类型：
--
作者：
Cong Xiao;Teng Ma;Yao Du
几十年来，在许多地区（如南亚和美洲国家），深层含水层中砷（As）含量低的地下水被过度开采，导致粘土含水层压实，含As的孔隙水释放到更深的含水层中。然而，砷在粘土弱透水层压实过程中的释放机理却知之甚少。通过室内压实试验，研究了粘土质弱透水层压实过程中As的释放机理。对压实过程中不同阶段孔隙水和沉积物样品中砷的化学特征和形态进行了分析。最初，铁氧化物的还原溶解是控制压实过程中As释放的关键过程。随着压力的增加，作为解吸从铁（氢）氧化物成为更重要的还原溶解作为主要驱动程序的释放。压实结束时，As的释放较弱，主要是从粘土或碳酸盐矿物中解吸。估算结果表明，江汉平原弱透水层压实区过量开采释放到地下水中的As浓度为9.33-118.09 μg/L。
Groundwater with low levels of arsenic (As) in deep aquifers has been overexploited for decades in many regions (such as South Asian and American countries), resulting in the compaction of clayey aquitards and the release of pore water with As into deeper aquifers. However, the release mechanism of arsenic during clayey aquitards compaction is poorly understood. An indoor compaction experiment using muddy sediments was conducted to identify the As-releasing mechanisms during clayey aquitards compaction. The chemical characteristics and As species in pore water and sediment samples collected at different stages during the compaction experiment were analyzed. Initially, the reductive dissolution of iron oxides was a key process controlling As release during compaction. With increased pressure, As desorption from Fe (hydr)oxides became more important than the reductive dissolution as the main driver for As release. At the end of the compaction, the release of As was weak and the dominant process was desorption of As from clay or carbonate minerals. Our estimate result in the Jianghan Plain suggested that As concentration release from aquitard compaction by overexploited into groundwater would be 9.33–118.09 μg/L.
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DOI：
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发表时间：
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期刊：
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