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首页> 外文会议>International Symposium on Water-Rock Interaction >Distribution of arsenic in an argillaceous sample using sequential chemical extractions: application to the Hydrogeological Experimental Site of Poitiers (HESP)
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Distribution of arsenic in an argillaceous sample using sequential chemical extractions: application to the Hydrogeological Experimental Site of Poitiers (HESP)

机译：使用顺序化学提取物在骨质样品中分布砷中的分布：应用于Poitiers的水文地质实验部位（Hesp）

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摘要

Arsenic mobility and transport into groundwater is highly dependent on its chemical distribution in sediments. In this study, a combination of sequential extraction and mineralogical investigation by X-ray diffraction on a sample collected from the hydrogeological experiment site of Poitiers (France) was tested to evaluate and predict the mobility of arsenic in different conditions. Results showed that the highest fraction of As (～35 %) was released by 25 % nitric acid however this fraction is poorly mobile under natural chemical conditions due to its high stability. Exchangeable As (～14 %) and As bound to iron and aluminium oxides (～12 %) exhibited a significant fraction that could be of high concern in case of change in the ionic composition and redox conditions, respectively. Soluble fraction comprised only 1 % of As which was in accordance with the composition of groundwater in the site.
机译：砷的流动性和运输到地下水中高度依赖于其沉积物中的化学分布。在该研究中，测试了从泊毒剂水文地质实验部位收集的样品中X射线衍射的顺序提取和矿物学研究的组合，评价并预测在不同条件下的砷的迁移率。结果表明，由于其高稳定性，在20％硝酸释放的最高一分（〜35％）的硝酸释放出来，因此该级分在天然化学条件下移动不佳。可兑换为（〜14％）和与氧化铝（〜12％）结合的（〜12％）表现出显着的级分，即在离子组合物和氧化还原条件的变化时可能具有高担心。可溶性级分包括1％，因为根据该部位的地下水的组成。

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