Phase transformation of schwertmannite changes microbial iron and sulfate-reducing processes in flooded paddy soil and decreases arsenic accumulation in rice (Oryza sativa L.)

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL

ACS Catalysis Pub Date : 2024-09-21 DOI:10.1016/j.soilbio.2024.109600

Ru Wang , Xinxin Wang , Hua Li , Xiaomeng Wang , Zengping Ning , Chengshuai Liu , Lixiang Zhou , Guanyu Zheng

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Abstract

Rice (Oryza sativa L.) is known to accumulate inorganic arsenic (iAs) and dimethylarsenate (DMA) in its grains, which threatens both human health and rice yield. Although schwertmannite, a metastable Fe (Ⅲ)-oxyhydroxysulfate mineral with extremely high adsorption capacity for iAs, has been proposed to remediate paddy soil to decrease As accumulation in rice, it remains unclear whether the phase transformation of schwertmannite would occur in flooded paddy soil and how its phase transformation changes the soil microbial processes that impact the accumulation of iAs and DMA in grains. Here, we found that amending As-contaminated paddy soil with 0.5%–1% (w/w) schwertmannite decreased the accumulation of iAs and DMA in grains by 37.41%–43.29% and 50.60%–73.89%, respectively, even though schwertmannite has transformed to goethite and secondary FeS was formed in both rhizosphere and bulk soils. The phase transformation of schwertmannite released a considerable amount of SO₄²⁻ into porewater, thereby increasing the abundances of both sulfate-reducing bacteria and the dsrB gene but decreasing the abundance of iron-reducing bacteria. This result suggested that schwertmannite phase transformation has promoted sulfate-reducing process and weakened iron-reducing process in flooded soil. Such promoted sulfate-reducing process and weakened iron-reducing process in paddy soil can decrease the reductive dissolution of As-bearing (oxyhydr)oxides, increase the formation of secondary FeS mineral for decreasing porewater As concentration, and strengthen the role of Fe plaque as a barrier for As absorption by rice. Additionally, the application of schwertmannite has decreased the abundance of arsM gene and weakened As methylation process in soil. Therefore, the effective decrease of iAs and DMA accumulation in rice grains by schwertmannite can not only be ascribed to the adsorption capacity of schwertmannite for As and the adsorption or incorporation of As by transformation products, but also contributed by the promoted sulfate-reducing process and the weakened iron-reducing process in flooded paddy soil.

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白云石的相变改变了水稻淹水土壤中微生物的铁和硫酸盐还原过程，并减少了水稻（Oryza sativa L.）的砷积累

众所周知，水稻（Oryza sativa L.）的谷粒中会积累无机砷（iAs）和二甲基砷酸酯（DMA），这对人类健康和水稻产量都构成了威胁。尽管有人建议用一种对 iAs 具有极高吸附能力的可蜕变铁（Ⅲ）-氧羟基硫酸盐矿物--施华洛世奇（schwertmannite）来修复稻田土壤，以减少水稻中砷的积累，但施华洛世奇是否会在水淹的稻田土壤中发生相变，以及其相变如何改变土壤微生物过程，从而影响 iAs 和 DMA 在谷物中的积累，这些问题仍不清楚。在这里，我们发现用 0.5%-1%（w/w）的石墨化黄铜改良砷污染的水稻土，可使 iAs 和 DMA 在谷物中的积累分别减少 37.41%-43.29% 和 50.60%-73.89% ，即使石墨化黄铜已转化为鹅辉石，并在根瘤菌层和大体积土壤中形成了次生 FeS。白云母的相变向孔隙水释放了大量的 SO42-，从而增加了硫酸盐还原菌和 dsrB 基因的丰度，但降低了铁还原菌的丰度。这一结果表明，在水淹土壤中，石墨化相变促进了硫酸盐还原过程，削弱了铁还原过程。这种促进了硫酸盐还原过程和削弱了铁还原过程的水稻土壤可减少含砷氧化物的还原溶解，增加次生 FeS 矿物的形成以降低孔隙水的砷浓度，并加强铁斑作为水稻吸收砷的屏障的作用。此外，施用施瓦剂降低了土壤中 arsM 基因的丰度，削弱了土壤中砷的甲基化过程。因此，施用白云石可有效减少水稻籽粒中 iAs 和 DMA 的积累，这不仅归因于白云石对 As 的吸附能力和转化产物对 As 的吸附或掺入，还与水淹稻田土壤中硫酸盐还原过程的促进和铁还原过程的减弱有关。

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来源期刊

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.