Simultaneous mitigation of Cd and As availability in soil-rice continuum via the addition of an Fe-based desulfurization material

文献类型： 外文期刊

第一作者： Feng, Qiufen

作者： Feng, Qiufen;Zeng, Xibai;Feng, Qiufen;Su, Shiming;Zhang, Nan;Zeng, Xibai;Zhu, Qihong;Yang, Zhonglan

作者机构：

关键词： Iron-based desulfurization; Cadmium; Arsenic; Paddy soil Passivation

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 812 卷

页码：

收录情况： SCI

摘要： The simultaneous mitigation of toxic arsenic (As) and cadmium (Cd) in rice grain remains a global challenge. Passivation with natural or artificially modified materials has shown great potential to simultaneously reduce the bioavail-ability of As and Cd in paddy soils. To date, however, limited materials have are available, with unclear underling mechanisms. Here, a natural iron-based desulfurization material is hypothesized to simultaneously mitigate As and Cd availability in paddy soil-rice continuum, since it is rich in calcium (Ca), iron (Fe), Silicon (Si), manganese (Mn), and sulfur (S). The addition of the proposed material promoted rice growth and reduced soil availability of Cd (extracted with 0.01 mg.L-1 of CaCl2) by 88.0-89.6% and As (extracted with 0.5 mg.L-1 of KH2PO4) by 37.9-69.9%. Grain Cd was reduced by 26.4-51.6%, whereas that of inorganic As (iAs) by 33.3-42.7%. The increased Fe (by 44.2%) and Mn (by 178.6%) in iron plaque on the root surface were conducive to the reduction of grain Cd and iAs after application. Furthermore, the maximum adsorption capacities of the proposed material for Cd and As(III) reached 526.31 and 2.67 mg.g(-1), respectively. The coprecipitation with Cd(OH)(2) as a product, Fe-As and Ca-kscornplexation, and ion exchange of Fe2+ released by the material with Cd2+ are involved in the mechanisms underlying the available As and Cd reduction. Combining the safety, low-cost, and high accessibility, Fe-based desulfurization material showed great potential for future sale-utilization of As-Cd contaminated paddy soil via passivation.

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