Schwertmannite effectively reduced the mobility of arsenic in paddy soil and arsenic uptake by rice: a field experiment

IF 3.4 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Applied Geochemistry Pub Date : 2025-08-07 DOI:10.1016/j.apgeochem.2025.106523

Jingang Xu, Yangyi Mao, Cheng Yan, Xuan Liu, Baoting Ding, Yan Dong, Bo Zhou, Minjiang Zhang, Dejing Zhang, Murong Wang, Lixiang Zhou

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引用次数: 0

Abstract

Rice (Oryza sativa L.) grain usually accumulated an elevated arsenic (As) in the As-contaminated paddy soil, posing a potential risk to food safety and human health. In this field experiment, three iron-based materials (zero-valent iron, schwertmannite, and ferrous sulfate) as As passivators were applied to investigate their roles in decreasing mobility of soil As and As uptake by rice. The results indicated that NaH₂PO₄-extractable available As and As in soil porewater were significantly decreased by the passivators especially schwertmannite throughout rice growth season. Meanwhile, the amount of iron plaque on rice root surface obviously increased due to application of schwertmannite. In addition, compared with the control without the addition of any passivator, applying zero-valent iron, schwertmannite, and ferrous sulfate decreased As in rice grain by 26.3 %, 46.6 %, and 31.8 %, respectively. Among these passivators, schwertmannite greatly reduced the content of total As and As (Ⅲ) in rice grain, as well as accumulation and translocation of As in rice tissues. In conclusion, schwertmannite was the promising environmental material for controlling As contamination in paddy soil.

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施魏特曼铁矿有效地降低了水稻土中砷的迁移率和水稻对砷的吸收

水稻（Oryza sativa L.）籽粒在砷污染的水稻土中通常会积累较高的砷，对食品安全和人体健康构成潜在风险。本试验采用三种铁基材料（零价铁、施沃特曼铁矿和硫酸亚铁）作为砷钝化剂，研究了它们对降低土壤砷迁移率和水稻对砷吸收的作用。结果表明，钝化剂对nah2po4可萃取有效态As和土壤孔隙水中As的影响显著降低，尤其是施魏氏锰酸盐。施施施魏特曼铵显著增加了水稻根表面铁膜的数量。此外，与未添加钝化剂的对照相比，施用零价铁、施魏氏锰矿和硫酸亚铁使稻谷中的砷含量分别降低了26.3%、46.6%和31.8%。在这些钝化剂中，schwertmannite大大降低了稻米中总As和As（Ⅲ）的含量，以及As在水稻组织中的积累和转运。综上所述，施特曼石是治理水稻土砷污染的理想环境材料。

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.