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首页> 外文会议>Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research >GEOCHEMICAL EVIDENCE OF ARSENIC TRANSPORT IN SHALLOW GROUND WATER, BANGLADESH
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GEOCHEMICAL EVIDENCE OF ARSENIC TRANSPORT IN SHALLOW GROUND WATER, BANGLADESH

机译：孟加拉国浅地水中砷运输的地球化学证据

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High Arsenic (As) in the shallow groundwater (GW) of the Southern Western Bangladesh has been recognized as the natural catastrophe since 1990s. This paper aims to unveil the likely geochemical phenomena that may dominate in both release and transport of As in that shallow alluvial aquifer. Observed linear relationships between As and Iron (Fe) contents both in sediment (R2=0.42) and in GW (R2=0.46) reflect their probable co-existence and co-precipitation characteristics. Speciation analysis with geochemical code PHREEQC shows that some Fe minerals have already been reached at the super saturation state, indicating further the subsequent co-precipitation of the accompanying As. Linear Equilibrium partition coefficient Kd (As) was noticed to vary inversely with dissolved Fe in a relatively high pH, reflecting the leaching potentiality of As from sediment to groundwater, due to the loss of promising sorption sites. HCO3 was reportedly found as the efficient leaching (24.5 μg/l) agent in releasing adsorbed As from the aquifer sediment.
机译：孟加拉国南部浅地下水（AS）的高砷（AS）被公认为自20世纪90年代以来的自然灾难。本文旨在推出可能在浅滩含水层中释放和运输中可能占主导地位的可能地球化学现象。观察到沉积物（R2 = 0.42）和GW（R2 = 0.46）之间的含铁（Fe）含量之间的线性关系反映了它们可能的共存和共析出特性。地球化学码Phreeqc的形态分析表明已经在超饱和状态下达到了一些Fe矿物质，表明随后的随后的共沉淀。由于有前途的吸附位点的丧失，注意到，注意到线性平衡分配系数Kd（AS）在相对高的pH中与溶解Fe反映溶解Fe，反映了从沉积物到地下水的浸出潜力。据报道，HCO3作为从含水层沉积物释放的有效浸出（24.5μg/ L）试剂。

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