Sustainable Immobilization of Arsenic by Man-Made Aerenchymatous Tissues in Paddy Soil

Zhao-Feng Yuan; Yujie Zhou; Zheng Chen

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Sustainable Immobilization of Arsenic by Man-Made Aerenchymatous Tissues in Paddy Soil

机译：Sustainable Immobilization of Arsenic by Man-Made Aerenchymatous Tissues in Paddy Soil

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Arsenic (As) is a major environmental pollutant and poses a significant health risk to humans through rice consumption. Elevating the soil redox potential (Eh) has been shown to reduce As bioavailability and decrease As accumulation in rice grains. However, sustainable methods for managing the Eh of rice paddies are lacking. To address this issue, we propose a new approach that uses man-made aerenchymatous tissues (MAT) to increase soil Eh by mimicking O2 release from wet plant roots. Our study demonstrated that the MAT method sustainably increased the soil Eh levels from -119 to -80.7 mV (~30%), over approximately 100 days and within a radius of around 5 cm from the surface of the MAT. Moreover, it resulted in a significant reduction (—28.5% to —63.3%) in dissolved organic carbon, Fe, Mn, and As concentrations. MAT-induced Fe(III) (oxyhydr)oxide minerals served as additional adsorption sites for dissolved As in soil porewater. Furthermore, MAT promoted the oxidation of arsenite to the less mobile arsenate by significantly enhancing the relative abundance of the aioA gene (130% increase in the 0—5 cm soil zone around MAT). The decrease in As bioavailability significantly reduced As accumulation in rice grains (—30.0%). This work offers a low-cost and sustainable method for mitigating As release in rice paddies by addressing the issue of soil Eh management.

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来源
《Environmental Science & Technology: ES&T》 |2023年第33期|12280-12290|共11页
作者
Zhao-Feng Yuan; Yujie Zhou; Zheng Chen;
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作者单位

Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 3100558, China;

Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 311058, China;

Department of Health and Environmental Sciences, Xi'an Jiaotong-Liverpool University, Suzhou 225123, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
Arsenic; Oxygen; Iron; Aerenchymatous tissues; Rice;

Sustainable Immobilization of Arsenic by Man-Made Aerenchymatous Tissues in Paddy Soil

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