University of South Australia, Future Industries Institute, SA, Australia.
University of South Australia, Future Industries Institute, SA, Australia.
J Hazard Mater. 2021 Sep 15;418:126312. doi: 10.1016/j.jhazmat.2021.126312. Epub 2021 Jun 5.
In this study, a novel method for lead (Pb) immobilization was developed in contaminated soils using iron (III) (Fe) in conjunction with 0.05 M HSO. During method optimization, a range of microwave treatment times, solid to solution ratios, and Fe(SO)/HSO concentrations were assessed using a mining/smelting impacted soil (BHK2, Pb: 3031 mg/kg), followed by treatment of additional Pb contaminated soils (PP, Pb: 1506 mg/kg, G10, Pb: 2454 mg/kg and SoFC-1, Pb: 6340 mg/kg) using the optimized method. Pb bioaccessibility was assessed using USEPA Method 1340, with Pb speciation determined by X-ray Absorption (XAS) spectroscopy. Treatment efficacy was also validated using an in vivo mouse assay, where Pb accumulation in femur, kidney and liver was assessed to confirm in vitro bioaccessibility outcomes. Results showed that Pb bioaccessibility could be reduced by 77.4-97.0% following treatment of soil with Fe(SO) (0.4-1.0 M), HSO (0.05 M) at 150 °C for 60 min in a closed microwave system. Results of bioavailability assessment demonstrated treatment effect ratio of 0.06-0.07 in femur, 0.06-0.27 in kidney and 0.06-0.11 in liver (bioavailability reduction between 73% and 93%). Formation of plumbojarosite in treated soils was confirmed by XAS analysis.
在这项研究中，使用铁(III)（Fe）与 0.05 M HSO 联合开发了一种在污染土壤中固定铅（Pb）的新方法。在方法优化过程中，使用采矿/冶炼污染土壤（BHK2，Pb：3031 mg/kg）评估了一系列微波处理时间、固液比和 Fe(SO)/HSO 浓度，然后使用优化的方法处理了其他 Pb 污染土壤（PP，Pb：1506 mg/kg，G10，Pb：2454 mg/kg 和 SoFC-1，Pb：6340 mg/kg）。使用美国环保署方法 1340 评估 Pb 生物可利用性，通过 X 射线吸收（XAS）光谱法确定 Pb 形态。还使用体内小鼠试验验证了处理效果，评估了 Pb 在股骨、肾脏和肝脏中的积累，以确认体外生物可利用性结果。结果表明，在用 Fe(SO)（0.4-1.0 M）和 HSO（0.05 M）在 150°C 下处理土壤 60 分钟的封闭微波系统中，Pb 生物可利用性可降低 77.4-97.0%。生物有效性评估的结果表明，在股骨中处理效果比为 0.06-0.07，在肾脏中为 0.06-0.27，在肝脏中为 0.06-0.11（生物有效性降低 73%-93%）。通过 XAS 分析证实了处理土壤中 Pb 黄钾铁矾的形成。
