Pristine/magnesium-loaded biochar and ZVI affect rice grain arsenic speciation and cadmium accumulation through different pathways in an alkaline paddy soil

文献类型： 外文期刊

第一作者： Zhang, Chen

作者： Zhang, Chen;Shi, Dong;Wang, Chao;Hu, Yanxia;Li, Xiaona;Hou, Yanhui;Zheng, Ruilun;Zhang, Chen;Li, Huafen;Sun, Guoxin

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关键词： Cadmium (Cd); Arsenic (As) speciation; Co-contamination; Magnesium-loaded biochar; Zero-valent iron (ZVI); Rice

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：6.9； 五年影响因子：6.2 ）

ISSN： 1001-0742

年卷期： 2025 年 147 卷

页码：

收录情况： SCI

摘要： Cadmium (Cd) and arsenic (As) co -contamination has threatened rice production and food safety. It is challenging to mitigate Cd and As contamination in rice simultaneously due to their opposite geochemical behaviors. Mg -loaded biochar with outstanding adsorption capacity for As and Cd was used for the first time to remediate Cd/As contaminated paddy soils. In addition, the effect of zero-valent iron (ZVI) on grain As speciation accumulation in alkaline paddy soils was first investigated. The effect of rice straw biochar (SC), magnesiumloaded rice straw biochar (Mg/SC), and ZVI on concentrations of Cd and As speciation in soil porewater and their accumulation in rice tissues was investigated in a pot experiment. Addition of SC, Mg/SC and ZVI to soil reduced Cd concentrations in rice grain by 46.1%, 90.3% and 100%, and inorganic As (iAs) by 35.4%, 33.1% and 29.1%, respectively, and reduced Cd concentrations in porewater by 74.3%, 96.5% and 96.2%, respectively. Reductions of 51.6% and 87.7% in porewater iAs concentrations were observed with Mg/SC and ZVI amendments, but not with SC. Dimethylarsinic acid (DMA) concentrations in porewater and grain increased by a factor of 4.9 and 3.3, respectively, with ZVI amendment. The three amendments affected grain concentrations of iAs, DMA and Cd mainly by modulating their translocation within plant and the levels of As(III), silicon, dissolved organic carbon, iron or Cd in porewater. All three amendments (SC, Mg/SC and ZVI) have the potential to simultaneously mitigate Cd and iAs accumulation in rice grain, although the pathways are different. (c) 2024 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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