Comparative effectiveness of activated dolomite phosphate rock and biochar for immobilizing cadmium and lead in soils
文献类型： 外文期刊
第一作者： Liu, Beibei
作者： Liu, Beibei;He, Zhenli;Liu, Ruliang;Liu, Beibei;Li, Qinfen;Montenegro, Andrea C.;Ellis, Martin;Baligar, Virupax C.
作者机构：
关键词： Available phosphorous; Extractability; Soil amendment; Sorption; Toxic metals
期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）
ISSN： 0045-6535
年卷期： 2021 年 266 卷
页码：
收录情况： SCI
摘要： Sandy soils in Florida are vulnerable to toxic metal pollution, and it is necessary to identify desirable amendments for the remediation of metal contaminated soils. Sorption and incubation experiments were conducted to compare the effectiveness of dolomite phosphate rock (DPR), humic acid activated dolomite phosphate rock (ADPR) and biochar (BC) in immobilizing Cd2+ and Pb2+ in two representative agricultural soils in south Florida (Alfisol-Riviera and Spodosol-Ankona series). The results showed that the soils had a low sorption capacity for metals with maximum sorption of 0.767-3.30 mg/g. Application of amendments increased the maximum sorption by 4.2-4.8 times for Pb2+ and 1.5-2.2 times for Cd2+ in Alfisol soil, and 7.1-7.9 times for Pb2+ and 1.7-3.1 times for Cd2+ in Spodosol soil. ADPR was the most effective amendment for increasing the soil's sorption capacity for Cd2+ and Pb2+. 0.01 M CaCl2 extractable metals in the contaminated soils were significantly decreased by all the amendments, especially ADPR, which reduced extractable Cd2+ and Pb2+ by 87.2 and 76.0% in Alfisol and 91.3 and 76.3% in Spodosol soil as compared to control. The amounts of extractable Cd2+ and Pb2+ were negatively correlated with soil pH and available P, indicating that the change of soil characteristics by amendments was the dominant mechanism for enhanced immobilization of metals in the contaminated soils. These results indicate that ADPR has great potential for remediating toxic levels of Cd2+ and Pb2+ in contaminated soils. (C) 2020 Elsevier Ltd. All rights reserved.
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