Biochar-supported nanoscale zero-valent iron can simultaneously decrease cadmium and arsenic uptake by rice grains in co-contaminated soil.
Sci Total Environ. 2022 Mar 25; 814:152798.ST

Abstract

Cadmium (Cd) and Arsenic (As) in rice grains are a primary exposure source for human beings. However, the simultaneous stabilization of Cd and As in soil becomes difficult due to the opposite properties of those. In this study, we investigated the simultaneous effects of biochar-supported nanoscale zero-valent iron (nZVI-BC) and water management on the decrease of Cd and As bioaccumulation in rice grain. Compared to the control, 0.25-1.00% nZVI-BC coupled with alternate wetting and drying (AWD) management simultaneously decreased the bioaccumulation of Cd and As in rice grains by 15.85-69.16% and 23.06-59.45%, respectively. The cancer risk associated with rice consumption effectively reduced by 15.60-52.41% after the application of nZVI-BC, and the lowest cancer risk was detected in 1.00% nZVI-BC under AWD management. Furthermore, rice cultivated under AWD management had a lower total cancer risk than that cultivated under continuous flooded (CF) management with the same amendment of type and dose. The reduction of soil Cd and As availability and the formation of iron plaque dominated the decrease of Cd and As uptake by rice grains. The elevated soil pH was responsible for Cd adsorption, and the dominant mechanism for As immobilization was the formation of complexes. The iron plaque was double-edged, promoting and inhibiting Cd uptake by rice, wherein the inhibition was predominant under aerobic conditions. In addition, iron plaque was a barrier to preventing the As accumulation by rice, a larger amount of As was immobilized on the iron plaque with nZVI-BC treatment. This study sheds new insights on the simultaneous remediation of Cd and As co-contaminated paddy fields.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Yang D

Institute of Soil and Water Resources and Environmental Science, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China.

MeSH

ArsenicCadmiumCharcoalHumansIronOryzaSoilSoil Pollutants

Pub Type(s)

Journal Article

Language

eng

PubMed ID

34990662

Citation

Yang, Dong, et al. "Biochar-supported Nanoscale Zero-valent Iron Can Simultaneously Decrease Cadmium and Arsenic Uptake By Rice Grains in Co-contaminated Soil." The Science of the Total Environment, vol. 814, 2022, p. 152798.

Yang D, Zhang J, Yang S, et al. Biochar-supported nanoscale zero-valent iron can simultaneously decrease cadmium and arsenic uptake by rice grains in co-contaminated soil. Sci Total Environ. 2022;814:152798.

Yang, D., Zhang, J., Yang, S., Wang, Y., Tang, X., Xu, J., & Liu, X. (2022). Biochar-supported nanoscale zero-valent iron can simultaneously decrease cadmium and arsenic uptake by rice grains in co-contaminated soil. The Science of the Total Environment, 814, 152798. https://doi.org/10.1016/j.scitotenv.2021.152798

Yang D, et al. Biochar-supported Nanoscale Zero-valent Iron Can Simultaneously Decrease Cadmium and Arsenic Uptake By Rice Grains in Co-contaminated Soil. Sci Total Environ. 2022 Mar 25;814:152798. PubMed PMID: 34990662.

* Article titles in AMA citation format should be in sentence-case

TY - JOUR T1 - Biochar-supported nanoscale zero-valent iron can simultaneously decrease cadmium and arsenic uptake by rice grains in co-contaminated soil. AU - Yang,Dong, AU - Zhang,Jiawen, AU - Yang,Shiyan, AU - Wang,Yan, AU - Tang,Xianjin, AU - Xu,Jianming, AU - Liu,Xingmei, Y1 - 2022/01/03/ PY - 2021/09/16/received PY - 2021/12/26/revised PY - 2021/12/26/accepted PY - 2022/1/7/pubmed PY - 2022/2/17/medline PY - 2022/1/6/entrez KW - Health risk KW - Rice KW - Soil remediation KW - Soil solution KW - Water management SP - 152798 EP - 152798 JF - The Science of the total environment JO - Sci Total Environ VL - 814 N2 - Cadmium (Cd) and Arsenic (As) in rice grains are a primary exposure source for human beings. However, the simultaneous stabilization of Cd and As in soil becomes difficult due to the opposite properties of those. In this study, we investigated the simultaneous effects of biochar-supported nanoscale zero-valent iron (nZVI-BC) and water management on the decrease of Cd and As bioaccumulation in rice grain. Compared to the control, 0.25-1.00% nZVI-BC coupled with alternate wetting and drying (AWD) management simultaneously decreased the bioaccumulation of Cd and As in rice grains by 15.85-69.16% and 23.06-59.45%, respectively. The cancer risk associated with rice consumption effectively reduced by 15.60-52.41% after the application of nZVI-BC, and the lowest cancer risk was detected in 1.00% nZVI-BC under AWD management. Furthermore, rice cultivated under AWD management had a lower total cancer risk than that cultivated under continuous flooded (CF) management with the same amendment of type and dose. The reduction of soil Cd and As availability and the formation of iron plaque dominated the decrease of Cd and As uptake by rice grains. The elevated soil pH was responsible for Cd adsorption, and the dominant mechanism for As immobilization was the formation of complexes. The iron plaque was double-edged, promoting and inhibiting Cd uptake by rice, wherein the inhibition was predominant under aerobic conditions. In addition, iron plaque was a barrier to preventing the As accumulation by rice, a larger amount of As was immobilized on the iron plaque with nZVI-BC treatment. This study sheds new insights on the simultaneous remediation of Cd and As co-contaminated paddy fields. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/34990662/Biochar_supported_nanoscale_zero_valent_iron_can_simultaneously_decrease_cadmium_and_arsenic_uptake_by_rice_grains_in_co_contaminated_soil_ DB - PRIME DP - Unbound Medicine ER -

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Biochar-supported nanoscale zero-valent iron can simultaneously decrease cadmium and arsenic uptake by rice grains in co-contaminated soil.Sci Total Environ. 2022 Mar 25; 814:152798.ST