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Arsenic immobilization and removal in contaminated soil using zero-valent iron or magnetic biochar amendment followed by dry magnetic separation.
Sci Total Environ. 2021 May 10; 768:144521.ST

Abstract

The potential of using zero-valent iron (ZVI) or a Fe3O4-loaded magnetic biochar to stabilize arsenic (As) in contaminated soil was investigated in the processes of incubation trial, chemical extraction, pot experiments with ryegrass growth. Additionally, a dry magnetic separation technique was applied to verify the possible permanent removal of As from the bulk soil. Results showed the ZVI amendment greatly reduced the As leaching, and the leached concentration became much lower than the Japanese environment standard (10 μg/L) after 180 days of incubation. Contrarily, the magnetic biochar amendment readily increased the As leachability due to the changes in pH, dissolved organic carbon, and soluble P and Si. The ZVI had a greater effect over the magnetic biochar, supported by the significantly reduced As leachability in the combined amendments. Furthermore, results from sequential extraction analysis indicate that both amendments significantly decreased the available As in (NH4)2SO4 and NH4H2PO4 extraction and increased the As bound to amorphous Fe oxides. But ZVI amendment alone performed better than magnetic biochar amendment alone. Plant growth experiment showed that the ZVI amendment enhanced ryegrass growth and significantly increased the ryegrass biomass. However, the magnetic biochar amendment resulted in an adverse effect on the ryegrass root growth, probably due to a marked enhancement of salinity. Meanwhile, the As uptake by ryegrass was significantly reduced in both ZVI and magnetic biochar-amended soils. Results of dry magnetic separation showed that averaged 20% and 25% of total As could be retrieved from ZVI and magnetic biochar amended soil, respectively; and the As bound to amorphous Fe oxides was the main retrieved fraction. This study indicated that ZVI or magnetic biochar could be applied as a promising amendment for reducing (phyto)availability of As in soil, and dry magnetic separation could be served as an alternative option for permanently removing As.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Li J
School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, China.
Zhang Y
School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, China.
Wang F
School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, China.
Wang L
Institute of Construction Materials, Technische Universität Dresden, 01062 Dresden, Germany. Electronic address: lei.wang1@mailbox.tu-dresden.de.
Liu J
Environment Research Institute, Shandong University, Qingdao, Shandong 266237, China.
Hashimoto Y
Department of Bioapplications and Systems Engineering (BASE), Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
Hosomi M
Department of Chemical Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.

MeSH

ArsenicCharcoalIronMagnetic PhenomenaSoilSoil Pollutants

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33450681

Citation

Li, Jining, et al. "Arsenic Immobilization and Removal in Contaminated Soil Using Zero-valent Iron or Magnetic Biochar Amendment Followed By Dry Magnetic Separation." The Science of the Total Environment, vol. 768, 2021, p. 144521.
Li J, Zhang Y, Wang F, et al. Arsenic immobilization and removal in contaminated soil using zero-valent iron or magnetic biochar amendment followed by dry magnetic separation. Sci Total Environ. 2021;768:144521.
Li, J., Zhang, Y., Wang, F., Wang, L., Liu, J., Hashimoto, Y., & Hosomi, M. (2021). Arsenic immobilization and removal in contaminated soil using zero-valent iron or magnetic biochar amendment followed by dry magnetic separation. The Science of the Total Environment, 768, 144521. https://doi.org/10.1016/j.scitotenv.2020.144521
Li J, et al. Arsenic Immobilization and Removal in Contaminated Soil Using Zero-valent Iron or Magnetic Biochar Amendment Followed By Dry Magnetic Separation. Sci Total Environ. 2021 May 10;768:144521. PubMed PMID: 33450681.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Arsenic immobilization and removal in contaminated soil using zero-valent iron or magnetic biochar amendment followed by dry magnetic separation. AU - Li,Jining, AU - Zhang,Ying, AU - Wang,Fenghe, AU - Wang,Lei, AU - Liu,Jing, AU - Hashimoto,Yohey, AU - Hosomi,Masaaki, Y1 - 2021/01/07/ PY - 2020/07/27/received PY - 2020/11/23/revised PY - 2020/12/11/accepted PY - 2021/1/16/pubmed PY - 2021/3/12/medline PY - 2021/1/15/entrez KW - Arsenic KW - Magnetic biochar KW - Magnetic separation KW - Ryegrass planting KW - Soil remediation KW - ZVI SP - 144521 EP - 144521 JF - The Science of the total environment JO - Sci Total Environ VL - 768 N2 - The potential of using zero-valent iron (ZVI) or a Fe3O4-loaded magnetic biochar to stabilize arsenic (As) in contaminated soil was investigated in the processes of incubation trial, chemical extraction, pot experiments with ryegrass growth. Additionally, a dry magnetic separation technique was applied to verify the possible permanent removal of As from the bulk soil. Results showed the ZVI amendment greatly reduced the As leaching, and the leached concentration became much lower than the Japanese environment standard (10 μg/L) after 180 days of incubation. Contrarily, the magnetic biochar amendment readily increased the As leachability due to the changes in pH, dissolved organic carbon, and soluble P and Si. The ZVI had a greater effect over the magnetic biochar, supported by the significantly reduced As leachability in the combined amendments. Furthermore, results from sequential extraction analysis indicate that both amendments significantly decreased the available As in (NH4)2SO4 and NH4H2PO4 extraction and increased the As bound to amorphous Fe oxides. But ZVI amendment alone performed better than magnetic biochar amendment alone. Plant growth experiment showed that the ZVI amendment enhanced ryegrass growth and significantly increased the ryegrass biomass. However, the magnetic biochar amendment resulted in an adverse effect on the ryegrass root growth, probably due to a marked enhancement of salinity. Meanwhile, the As uptake by ryegrass was significantly reduced in both ZVI and magnetic biochar-amended soils. Results of dry magnetic separation showed that averaged 20% and 25% of total As could be retrieved from ZVI and magnetic biochar amended soil, respectively; and the As bound to amorphous Fe oxides was the main retrieved fraction. This study indicated that ZVI or magnetic biochar could be applied as a promising amendment for reducing (phyto)availability of As in soil, and dry magnetic separation could be served as an alternative option for permanently removing As. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/33450681/Arsenic_immobilization_and_removal_in_contaminated_soil_using_zero_valent_iron_or_magnetic_biochar_amendment_followed_by_dry_magnetic_separation_ DB - PRIME DP - Unbound Medicine ER -