高砷含水层沉积物含铁矿物特性及其对砷的水文地球化学作用

发布时间：2018-06-04 23:52

  本文选题：内蒙古 + 动力学　； 参考：《水文地质工程地质》2017年02期

【摘要】：含水层沉积物中含铁矿物的特征与活性会影响砷的迁移转化行为。通过内蒙古含水层沉积物含铁矿物的溶解、还原动力学实验,研究了沉积物含铁矿物特征和活性及其与砷运移的关系。结果表明,沉积物中具还原活性的铁氧化物总量(m0)与岩性有关,细砂为5.2μmol/g,黏土为45μmol/g。初始还原速率k'均在10-5s-1的数量级。表征活性均匀度的参数γ值介于合成铁氧化物矿物和表层沉积物之间。沉积物中Fe(Ⅲ)氧化物的还原活性主要介于人造纤铁矿与针铁矿的活性水平范围内。沉积物中可能存在两类活性水平不同的Fe(Ⅲ)氧化物。As更倾向于吸附在活性较强的Fe(Ⅲ)氧化物上。还原环境中,活性较强的Fe(Ⅲ)氧化物的还原性溶解,促进了沉积物中砷的释放。
[Abstract]:The characteristics and activities of Fe-bearing minerals in aquifer sediments affect the migration and transformation of arsenic. Based on the kinetic experiments of dissolution and reduction of iron-bearing minerals in the sediments of Inner Mongolia aquifer, the characteristics and activities of iron-bearing minerals in sediments and their relationship with arsenic transport were studied. The results show that the total amount of iron oxides with reducing activity in sediments is related to lithology, the fine sand is 5.2 渭 mol / g, and the clay is 45 渭 mol / g. The initial reduction rate k'is in the order of magnitude of 10-5s-1. The parameter 纬 value of activity uniformity is between synthetic iron oxide minerals and surface sediments. The reduction activity of Fe (鈪，

本文编号：1979425