Department of Environmental Geochemistry, IRNASA, CSIC, Apdo. 257, 37071 Salamanca, Spain.
Chemosphere. 2013 Feb;90(8):2233-9. doi: 10.1016/j.chemosphere.2012.09.086. Epub 2012 Oct 31.
Soil pollution with antimony is of increasing environmental concern worldwide. Measures for its control and to attenuate the risks posed to the ecosystem are required. In this study the application of several iron and aluminium oxides and oxyhydroxides as soil amendments was evaluated in order to assess their feasibility to stabilize Sb in mining polluted soils. Mine soils with different pollution levels were amended with either goethite, ferrihydrite or amorphous Al oxide at various ratios (0-10%). The effectiveness of such treatments was assessed by both batch and column leaching tests. The use of ferrihydrite or amorphous Al oxide proved to be highly effective to stabilize Sb. Immobilization levels of 100% were found when doses of 5% ferrihydrite or 10% amorphous Al oxide were applied, regardless of the soil Sb load. Column leaching studies also showed a high Sb leaching reduction (>75%) when soils were amended with 1% ferrihydrite or 5% amorphous Al oxide. Moreover, such treatments proved to simultaneously immobilize As and Pb in a great extent when soils were also polluted with such toxic elements.
土壤中锑的污染引起了全世界越来越多的环境关注。需要采取措施加以控制，并减轻其对生态系统构成的风险。本研究评估了几种铁和铝氧化物和氢氧化物作为土壤改良剂的应用，以评估它们稳定矿区污染土壤中锑的可行性。用不同比例（0-10%）的针铁矿、水铁矿或无定形 Al 氧化物对具有不同污染水平的矿土进行了改良。通过批量和柱浸出试验评估了这些处理的效果。水铁矿或无定形 Al 氧化物的使用被证明对稳定 Sb 非常有效。当施加 5%水铁矿或 10%无定形 Al 氧化物时，固定 Sb 的水平达到 100%，而与土壤 Sb 负荷无关。柱浸出研究还表明，当用 1%水铁矿或 5%无定形 Al 氧化物改良土壤时，Sb 的浸出率降低了 75%以上。此外，当土壤受到这些有毒元素的污染时，这些处理还被证明可以同时大量固定 As 和 Pb。
