The Fe 3 O 4 -modified biochar reduces arsenic availability in soil and arsenic accumulation in indica rice (Oryza sativa L.)

Arsenic (As)-contaminated paddy soil could result in elevated levels of As in rice plants and sequentially harm human health. The Fe O -modified biochar (NBC-Fe) prepared by the coprecipitation method was applied in a pot experiment to investigate its effect on mobility and bioavailability of As in...

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Published in:Environmental science and pollution research international 2021-04, Vol.28 (14), p.18050
Main Authors: Yao, Yao, Zhou, Hang, Yan, Xiu-Lan, Yang, Xiao, Huang, Kang-Wen, Liu, Juan, Li, Li-Juan, Zhang, Jing-Yi, Gu, Jiao-Feng, Zhou, Yaoyu, Liao, Bo-Han
Format: Article
Language:English
Subjects:
Arsenic - analysis
Cadmium - analysis
Charcoal
China
Humans
Oryza
Plant Roots - chemistry
Soil
Soil Pollutants - analysis
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Summary:Arsenic (As)-contaminated paddy soil could result in elevated levels of As in rice plants and sequentially harm human health. The Fe O -modified biochar (NBC-Fe) prepared by the coprecipitation method was applied in a pot experiment to investigate its effect on mobility and bioavailability of As in soil and to reduce As accumulation in rice tissues (brown rice, husks, spikelets, leaves, stems, and roots). Compared with non-application (CK), application of NBC-Fe significantly increased the cation exchange capacity (CEC), decreased As availability, and raised the As concentration of crystalline hydrous oxide-bound fraction in the soil. The addition of 0.05-1.6% (w/w) NBC-Fe significantly reduced the As concentrations in brown rice by 9.4-47.3%, which was lower than the level set by the National Food Safety Standards of China (0.2 mg/kg). The NBC-Fe treatment decreased As concentrations in iron plaque (DCB-As), and the DCB-As had the very significant correlations (P 
ISSN:1614-7499