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In this study, a novel method for lead (Pb) immobilization was developed in contaminated soils using iron (III) (Fe3+) in conjunction with 0.05 M H2SO4. During method optimization, a range of microwave treatment times, solid to solution ratios, and Fe2(SO4)3/H2SO4 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 us