Mitigating arsenic accumulation in rice ( Oryza sativa L.) using Fe-Mn-La-impregnated biochar composites in arsenic-cont
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RESEARCH ARTICLE
Mitigating arsenic accumulation in rice (Oryza sativa L.) using Fe-Mn-La-impregnated biochar composites in arsenic-contaminated paddy soil Lina Lin 1 & Minling Gao 2 & Zhengguo Song 2
&
Haiyan Mu 3
Received: 22 April 2020 / Accepted: 8 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Arsenic (As) is a prominent metal contaminant of the soil in China. Pot experiments were conducted to examine the effects of corn stem powder biochar (BC) and Fe-Mn-La-impregnated biochar composites (FMLBC1, FMLBC2, and FMLBC3; BC:Fe:Mn:La at different weight ratios) on As accumulation in an indica cultivar of rice (Oryza sativa L.). The application of FMLBCs and BC improved the dry weight of the grains, leaves, stems, and roots of rice. The As uptake in different rice organs was significantly reduced in the FMLBC-amended soils (FMLBC3 > FMLBC2 > FMLBC1) compared with the BC treatment. Compared to the concentration of As in the control, the concentration of As in rice grains decreased by 56.0–89.4% with the addition of 2% FMLBC3. The application of FMLBCs significantly increased the ratio of essential amino acids in grains and the contents of Fe and Mn plaques on root surfaces. The reduction in As accumulation can be ascribed to the Fe, Mn, and La oxides that enhance the adsorption and retention of As, as well as the FMLBCs that provide nutrients and create a rhizosphere environment, promoting rice growth. This study demonstrated that applications of 2% FMLBC2 and FMLBC3 have the potential to remediate As-contaminated soils, reduce As accumulation in rice plants, and improve rice grain quality. Keywords Arsenic . Accumulation . Fe-Mn-La-impregnated biochar composites . Rice . Paddy soil
Introduction Based on the National Soil Survey of 2014 by the Chinese Ministry of Environmental Protection and Ministry of Land and Resources, arsenic (As) is a prominent metal contaminant of soils in China. As is a toxic metalloid element that is of great environmental concern and is attracting attention Responsible Editor: Zhihong Xu Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10083-w) contains supplementary material, which is available to authorized users. * Zhengguo Song [email protected] 1
Agro-Environmental Protection Institute, Ministry of Agriculture of China, Tianjin 300191, China
2
Department of Civil and Environmental Engineering, Shantou University, Shantou 515063, China
3
Tangshan Ruikun Environmental Testing Service Co., Ltd., Tangshan 064200, China
because of its potential adverse impact on food safety. In Hunan, As has contaminated paddy soils because of metal processing and mining activities (Zhao et al. 2015; Zheng et al. 2015). The level of acceptable As in agricultural soil, according to the Chinese National Environmental Quality Standards, is 30 mg·kg− 1 in flooded soils (GB15618-1995), whereas in Hunan, the concentration of As in mine-impacted paddy soils is 34–2268 mg·kg− 1 (Hu et al. 2015; Yin et al. 2016).
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