1 Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic.
1 Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic.
J Hazard Mater. 2015 Apr 9;286:386-94. doi: 10.1016/j.jhazmat.2015.01.018. Epub 2015 Jan 7.
An amorphous manganese oxide (AMO) and a Pb smelter-polluted agricultural soil amended with the AMO and incubated for 2 and 6 months were subjected to a pH-static leaching procedure (pH 3-8) to verify the chemical stabilization effect on metals and metalloids. The AMO stability in pure water was pH-dependent with the highest Mn release at pH 3 (47% dissolved) and the lowest at pH 8 (0.14% dissolved). Secondary rhodochrosite (MnCO3) was formed at the AMO surfaces at pH>5. The AMO dissolved significantly less after 6 months of incubation. Sequential extraction analysis indicated that "labile" fraction of As, Pb and Sb in soil significantly decreased after AMO amendment. The pH-static experiments indicated that no effect on leaching was observed for Cd and Zn after AMO treatments, whereas the leaching of As, Cu, Pb and Sb decreased down to 20%, 35%, 7% and 11% of the control, respectively. The remediation efficiency was more pronounced under acidic conditions and the time of incubation generally led to increased retention of the targeted contaminants. The AMO was found to be a promising agent for the chemical stabilization of polluted soils.
采用 pH 静态浸出法（pH 3-8）对添加了无定形氧化锰（AMO）的 Pb 冶炼厂污染农田土壤进行为期 2 和 6 个月的孵育，以验证其对金属和类金属的化学稳定效果。AMO 在纯水中的稳定性随 pH 值而变化，在 pH 3 时 Mn 的释放量最高（溶解 47%），在 pH 8 时最低（溶解 0.14%）。在 pH>5 时，AMO 表面形成了次生菱锰矿（MnCO3）。孵育 6 个月后，AMO 溶解明显减少。顺序提取分析表明，AMO 改良后土壤中 As、Pb 和 Sb 的“不稳定”分数显著降低。pH 静态实验表明，AMO 处理后 Cd 和 Zn 的浸出没有影响，而 As、Cu、Pb 和 Sb 的浸出分别下降到对照的 20%、35%、7%和 11%。在酸性条件下修复效率更为显著，孵育时间通常会导致目标污染物的保留增加。AMO 被发现是一种有前途的化学稳定污染土壤的试剂。
