Impact of humidity levels on arsenic leaching in iron-stabilized soil
This work contains further studies of iron (Fe) applications for the stabilization of arsenic (As)- contaminated soil. Its aim is to identify how the leaching of As changes over time depending on the humidity level of the stabilized soil. Two types of iron amendments were used for contaminant stabilization in the soil: iron grit (97％ Fe<0>) and oxygen scarfing granulate (OSG: 69％ Fe3O4;28％ Fe <0>). The soil was placed into a concrete blender and while rotating mixed with 1％, 7％ and 15％ (wt) of OSG or 0.1％ and 1％ (wt) of Fe<0>. Half of the samples were stored at humidity level corresponding to 50％ water holding capacity (WHC), and the other half were kept water saturated (100％ WHC). Four soil pore water samples were taken during the first year and one a year later (five samples in total). At high concentrations (7％ and 15％ (wt)), OSG was an effective amendment for As immobilization. The effect of 1％ (wt) iron grit on As was also significant, but lower than observed in the previous studies. Storage conditions of As contaminated soil, even after stabilization with Fe, can be detrimental for As stability. Soil saturated with water increased As release by two orders of magnitude in all mixtures except for the 15％ OSG sample. The soil was let to dry after the first year, which showed to considerably influence As mobility in water saturated samples: leaching of As in resaturated samples was even lower than at the beginning of the experiment.
contaminated soil immobilization magnetite
J. Kumpiene S. Lidelow C. Maurice
Division of Waste Science and Technology, Lulea University of Technology, SE-971 87 Lulea Sweden
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
982-983
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）