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Comparative effectiveness of activated dolomite phosphate rock and biochar for immobilizing cadmium and lead in soils

文献类型： 外文期刊

作者： Liu, Beibei 1 ; He, Zhenli 1 ; Liu, Ruliang 1 ; Montenegro, Andrea C. 3 ; Ellis, Martin 4 ; Li, Qinfen 2 ; Baligar, Vi 1 ;

作者机构： 1.Univ Florida, Dept Soil & Water Sci, Inst Food & Agr Sci, Indian River Res & Educ Ctr, Ft Pierce, FL 34945 USA

2.Chinese Acad Trop Agr Sci, Inst Environm & Plant Protect, Haikou, Hainan, Peoples R China

3.Corp Colombiana Invest Agr AGROSAVIA, Ctr Invest Tibaitata, Km 14 Via Mosquera Bogota, Cundinamarca, Colombia

4.Green Carbon Solut GCS, Pepper Pike, OH 44124 USA

5.USDA ARS, Beltsville Agr Res Ctr, Beltsville, MD USA

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.

  • 相关文献

[1]Comparative effectiveness of activated dolomite phosphate rock and biochar for immobilizing cadmium and lead in soils. Liu, Beibei,He, Zhenli,Liu, Ruliang,Liu, Beibei,Li, Qinfen,Montenegro, Andrea C.,Ellis, Martin,Baligar, Virupax C.. 2021

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