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Geochemical Evolution of Groundwater Flowing Through Arsenic Source Sediments in an Aquifer System of West Bengal, India

机译：印度西孟加拉邦含水层系统中流经砷源沉积物的地下水的地球化学演化

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摘要

The source of geogenic arsenic (As) contaminating a shallow aquifer in West Bengal was traced to fine-grained sediments deposited in an abandoned river channel. Along with As-bearing phases, these sediments contain 0.46% codeposited organic carbon. The release of As and the geochemistry of groundwater within the channel-fill deposits is investigated using a detailed mass balance model supported by aqueous, solid-phase, and mineralogical data. The model describes the evolution of groundwater chemistry along a flow path extending from its recharge in an abandoned channel pond, through the channel fill, to the underlying aquifer. Variations in groundwater composition are explained in terms of mineral weathering of host sediments driven by organic carbon decay. Arsenic is released through the reductive dissolution of goethite and the weathering of chlorite. Concomitantly, some As is sequestered in precipitating vivianite. These competing processes reach equilibrium deeper in the channel-fill sequence as groundwater As concentrations stabilize. The model yields estimates of mineral reaction (or precipitation) rates including rates of organic carbon oxidation (1.15 mmol CL-1 a(-1)) and net As release (4.57 x 10(-4) mmol L-1 a(-1)). Fine-grained, slightly permeable, deposits such as channel fill containing reactive organic carbon and As-bearing goethite and phyllosilicates are centers of intense chemical weathering conducive to As mobilization.
机译：西孟加拉邦的一个浅层含水层污染了地源砷（As），其源头是沉积在废弃河道中的细颗粒沉积物。除含砷相外，这些沉积物还含有0.46％的共沉积有机碳。使用含水，固相和矿物学数据支持的详细质量平衡模型，研究了河道填充物沉积物中砷的释放和地下水的地球化学。该模型描述了地下水化学物质沿着一条流动路径的演变过程，该流动路径从其在废弃的河道池塘中的补给，通过河道填充物延伸到下面的含水层。地下水组成的变化是根据有机碳衰减驱动的宿主沉积物的矿物风化来解释的。砷通过针铁矿的还原溶解和亚氯酸盐的风化而释放。伴随地，一些砷被螯合在沉淀云母中。随着地下水浓度的稳定，这些竞争过程在通道填充序列的更深处达到平衡。该模型可估算矿物反应（或沉淀）速率，包括有机碳氧化速率（1.15 mmol CL-1 a（-1））和净砷释放速率（4.57 x 10（-4）mmol L-1 a（-1） ））。细粒，微渗透性沉积物（例如含有活性有机碳，含As针铁矿和层状硅酸盐的通道填充物）是强烈的化学风化中心，有助于As的迁移。

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  • 来源
    《Water resources research》 |2017年第11期|8715-8735|共21页
  • 作者

    Desbarats A. J.; Pal T.; Mukherjee P. K.; Beckie R. D.;

  • 作者单位

    Nat Resources Canada, Geol Survey Canada, Ottawa, ON, Canada;

    Geol Survey India, Kolkata, W Bengal, India;

    Geol Survey India, Miss IIIC, Kolkata, W Bengal, India;

    Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC, Canada;

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  • 正文语种 eng
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  • 关键词

    arsenic; groundwater; India;

    机译：砷;地下水;印度;

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