An outdoor pot experiment was conducted to study the control effects of zero-valent iron (Fe⁰) on arsenic (As) uptake by rice (Oryza sativa L.) and its relationship with iron (Fe), As, and phosphorus (P) in soil and Fe plaque. The results showed that Fe⁰ reduced total and inorganic As in root, husk, and grain but had no significant effect in straw, and almost all contents of As species in rice plant were decreased by Fe⁰. Total As contents in root, husk, and grain were decreased (54.8%, 39.9%, 30.1%), while reductions of inorganic As were 59.2%, 30.8%, and 30.3%, respectively. The inorganic As in all issues of rice plant was dominated and higher than 70% of total As. The analysis showed that the main mechanisms of Fe⁰ on reduction of As in rice were (i) Fe⁰ stabilized the active As in soil, (ii) Fe⁰ increased the quantity of Fe plaque that hindered the transport of arsenic in soil to rice plant, and (iii) phosphorus adsorbed on the Fe plaque reduced As into rice root by the competitive mechanism between phosphorus and arsenic.

Graphical abstract

中文翻译：

---

零价铁对水稻（水稻）吸收砷的影响及其与土壤和铁斑块中铁，砷和磷的关系

进行了室外盆栽试验，研究了零价铁（Fe ⁰）对水稻（Oryza sativa L.）吸收砷（As）的控制作用及其与铁（Fe），As和磷（P）的关系。在土壤和铁斑中。结果表明，Fe ⁰减少了根，壳和谷粒中的总无机As含量，但对秸秆无明显影响，Fe ⁰降低了水稻植株中几乎所有的As含量。根，壳和谷粒中总砷的含量减少了（54.8％，39.9％，30.1％），而无机砷的减少分别为59.2％，30.8％和30.3％。在所有水稻植物中，无机砷占主导地位，占总砷的70％以上。分析表明，Fe ⁰的主要机理（i）Fe ⁰稳定了土壤中的活性As，（ii）Fe ⁰增加了阻碍土壤中砷向水稻植物迁移的Fe斑块的数量，以及（iii）磷吸附在水稻上铁斑通过磷与砷之间的竞争机制将砷还原成水稻根。

图形概要