Co-occurrence perspective of arsenic and fluoride in the groundwater of Diphu, Assam, Northeastern India
Co-occurrence perspective of arsenic and fluoride in the groundwater of Diphu, Assam, Northeastern India
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DOI：
10.1016/j.chemosphere.2016.02.019
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发表时间：
2016-05-01
期刊：
影响因子：
8.8
通讯作者：
Singh, Umesh Kumar
中科院分区：
文献类型：
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作者：
Kumar, Manish;Das, Aparna;Singh, Umesh Kumar
雅鲁藏布江和恒河漫滩的砷和氟共同污染调查存在相当大的空白。因此，我们选择了位于雅鲁藏布江泛滥平原的卡尔比高原上的迪普镇（Diphu）来评估 As 和 F 的共生情况、与含水层系统共存离子的相关性，并阐明地下水中 As 和 F- 释放的潜在过程。我们的初步评估使用通用图来识别水文地球化学过程和主要水类型。随后，探讨了 As 和 F- 与 pH、深度、HCO3-、SO42-、Ca2+ 和 Fe 的共现可能的相关性，然后进行层次聚类分析，以确定共现的关键过程。最后，使用 MIINTEQA2 计算地下水矿物质的饱和指数，以阐明砷和氟向地下水的预期释放量。结果表明，富含 Ca-HCO3 的水中存在 F- 和 As，并且 Ca2+ 和 F- 之间呈正相关，这可能是由于邻近地区的石灰石储量所致。多变量分析表明，高浓度的 PO43- 和 H4SiO4 单独或组合存在可以增强 As 和 F- 的流动性，并可能助长有利于含水层共同污染的条件。 As 和 F- 从母岩中的初始释放似乎是由人类活动驱动的，而释放则取决于元素的化学相互作用和个体亲和力。形态形成的结果强调了 As 和 F- 进一步进入地下水，这反过来又需要定期关注该地区稀缺水资源的可持续管理。 (C) 2016 Elsevier Ltd. 保留所有权利。
Considerable lacunae exists in As and F- co-contamination investigation in the Brahmaputra and Gangetic floodplains. Therefore we selected Diphu a township in the Karbi Plateau rising from the Brahmaputra floodplains for evaluation of As and F co-occurrence, correlation with coexisting ions of the aquifer system and elucidation of potential processes for releasing As and F- in the groundwater. Our initial appraisal used generic plots for identification of hydro geochemical processes and major water types. Subsequently, As and F- co-occurrence with pH, depth, HCO3-, SO42-, Ca2+ and Fe were probed for possible correlation followed by hierarchical cluster analyses to identify key processes for co-occurrence. Finally, saturation indices of groundwater minerals were calculated using MINTEQA2 to elucidate prospective As and F- release into groundwater. Results indicate F- and As presence in Ca-HCO3 rich water along with positive correlation between Ca2+ and F- possibly due to limestone reserves in adjoining areas. Multivariate analyses suggest the presence of high concentrations of PO43-, and H4SiO4 either individually or in combination can enhance the mobility of both As and F- and possibly abet conditions conducive for co-contamination of aquifers. Initial release of As and F- from the parent rock seems driven by the anthropogenic activities while mobilization depends on chemical interactions and individual affinities of the elements. The results of speciation highlight further mobilization of As and F- into the groundwater which in turn require regular attention for sustainable management of scarce water resource present in the area. (C) 2016 Elsevier Ltd. All rights reserved.