Impact of water saturation level on arsenic and metal mobility in the Fe-amended soil
Impact of water saturation level on arsenic and metal mobility in the Fe-amended soil
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DOI：
10.1016/j.chemosphere.2008.09.068
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发表时间：
2009-01-01
期刊：
影响因子：
8.8
通讯作者：
Maurice, Christian
中科院分区：
文献类型：
--
作者：
Kumpiene, Jurate;Ragnvaldsson, Daniel;Maurice, Christian
研究了含水饱和度（氧化还原环境）对铬、铜、砷（CCA）污染土壤中As和金属溶解度的影响。将土壤与0.1和1重量%的铁砂（Fe（0））和1、7和15重量%的氧清除剂（OSG，钢加工的副产物）混合。通过间歇淋洗试验和土壤孔隙水分析，研究了砷和重金属的溶解性。土壤饱和度与水大大增加了As的溶解度在未经处理的，以及在铁修正的土壤，这是有关的还原溶解的铁氧化物和增加浓度的As（III）物种。好氧和缺氧条件下，铁改良剂表现出降低砷的能力。土壤孔隙水的细胞毒性与As（III）浓度相关。Fe处理和土壤含水饱和度对Cu、Cr和Zn的溶解度影响不如As显著。用于废物定性的分批浸出试验大大低估了在水饱和（厌氧）条件下可能发生的砷溶解度。在土壤填埋的情况下，除了含砷土壤的铁稳定化之外，还应考虑其他技术。(C)2008爱思唯尔有限公司保留所有权利。
The impact of water saturation level (oxidizing-reducing environment) on As and metal solubility in chromium, copper, arsenic (CCA)-contaminated soil amended with Fe-containing materials was studied. The soil was mixed with 0.1 and 1 wt% of iron grit (Fe(0)) and 1, 7 and 15 wt% of oxygen scarfing granulate (OSG, a by-product of steel processing). Solubility of As and metals was evaluated by a batch leaching test and analysis of soil pore water. Soil saturation with water greatly increased As solubility in the untreated as well as in the Fe-amended soil, This was related to the reductive dissolution of Fe oxides and increased concentration of As(III) species. Fe amendments showed As reducing capacity under both oxic and anoxic conditions. The cytotoxicity of the soil pore water correlated with the concentration of As(III). The Fe-treatments as well as water saturation of soil were less significant for the solubility of Cu, Cr and Zn than for As. The batch leaching test used for waste characterization substantially underestimated As solubility that could occur under water-saturated (anaerobic) conditions. In the case of soil landfilling, other techniques than Fe-stabilization of As containing soil should be considered. (C) 2008 Elsevier Ltd. All rights reserved.