1. The Fe3O4-modified biochar reduces arsenic availability in soil and arsenic accumulation in indica rice (Oryza sativa L.)
- Author
-
Xiao Yang, Juan Liu, Yao Yao, Li-Juan Li, Kang-Wen Huang, Bo-Han Liao, Xiulan Yan, Jiao-Feng Gu, Yaoyu Zhou, Jing-Yi Zhang, and Hang Zhou
- Subjects
Oryza sativa ,Chemistry ,Environmental remediation ,Health, Toxicology and Mutagenesis ,Amendment ,food and beverages ,chemistry.chemical_element ,General Medicine ,010501 environmental sciences ,01 natural sciences ,Pollution ,Husk ,Horticulture ,Biochar ,Cation-exchange capacity ,Environmental Chemistry ,Brown rice ,Arsenic ,0105 earth and related environmental sciences - Abstract
Arsenic (As)-contaminated paddy soil could result in elevated levels of As in rice plants and sequentially harm human health. The Fe3O4-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
- Published
- 2021